21312231232212 has 36 divisors (see below), whose sum is σ = 54610565120020. Its totient is φ = 7006760952192.

The previous prime is 21312231232211. The next prime is 21312231232213. The reversal of 21312231232212 is 21223213221312.

21312231232212 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 22 + 312 + 322 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21312231232211) and next prime (21312231232213).

It can be written as a sum of positive squares in 2 ways, for example, as 7720651303236 + 13591579928976 = 2778606^2 + 3686676^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21312231232212² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312231232211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4054835887 + ... + 4054841142.

Almost surely, 2^{21312231232212} is an apocalyptic number.

It is an amenable number.

21312231232212 is an abundant number, since it is smaller than the sum of its proper divisors (33298333887808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21312231232212 is a wasteful number, since it uses less digits than its factorization.

21312231232212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8109677112 (or 8109677107 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 21312231232212 its reverse (21223213221312), we get a palindrome (42535444453524).

The spelling of 21312231232212 in words is "twenty-one trillion, three hundred twelve billion, two hundred thirty-one million, two hundred thirty-two thousand, two hundred twelve".