21011021012212 has 144 divisors (see below), whose sum is σ = 47362126242816. Its totient is φ = 8063902560000.

The previous prime is 21011021012209. The next prime is 21011021012227. The reversal of 21011021012212 is 21221012011012.

It is a super-2 number, since 2×21011021012212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42653037 + ... + 43142827.

It is an arithmetic number, because the mean of its divisors is an integer number (328903654464).

Almost surely, 2^{21011021012212} is an apocalyptic number.

21011021012212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011021012212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23681063121408).

21011021012212 is an abundant number, since it is smaller than the sum of its proper divisors (26351105230604).

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

21011021012212 is a wasteful number, since it uses less digits than its factorization.

21011021012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490118 (or 490109 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21011021012212 its reverse (21221012011012), we get a palindrome (42232033023224).

The spelling of 21011021012212 in words is "twenty-one trillion, eleven billion, twenty-one million, twelve thousand, two hundred twelve".