21320121112212 has 24 divisors (see below), whose sum is σ = 53573637666976. Its totient is φ = 6560037265248.

The previous prime is 21320121112211. The next prime is 21320121112249. The reversal of 21320121112212 is 21221112102312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320121112211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68333721358 + ... + 68333721669.

Almost surely, 2^{21320121112212} is an apocalyptic number.

It is an amenable number.

21320121112212 is an abundant number, since it is smaller than the sum of its proper divisors (32253516554764).

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

21320121112212 is a wasteful number, since it uses less digits than its factorization.

21320121112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136667443047 (or 136667443045 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21320121112212 its reverse (21221112102312), we get a palindrome (42541233214524).

The spelling of 21320121112212 in words is "twenty-one trillion, three hundred twenty billion, one hundred twenty-one million, one hundred twelve thousand, two hundred twelve".