21021100012212 has 48 divisors (see below), whose sum is σ = 51935181661440. Its totient is φ = 6594766108672.

The previous prime is 21021100012201. The next prime is 21021100012219. The reversal of 21021100012212 is 21221000112012.

It is a junction number, because it is equal to n+sod(n) for n = 21021100012191 and 21021100012200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021100012219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15407989 + ... + 16716707.

It is an arithmetic number, because the mean of its divisors is an integer number (1081982951280).

Almost surely, 2^{21021100012212} is an apocalyptic number.

It is an amenable number.

21021100012212 is an abundant number, since it is smaller than the sum of its proper divisors (30914081649228).

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

21021100012212 is a wasteful number, since it uses less digits than its factorization.

21021100012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387480 (or 1387478 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021100012212 its reverse (21221000112012), we get a palindrome (42242100124224).

The spelling of 21021100012212 in words is "twenty-one trillion, twenty-one billion, one hundred million, twelve thousand, two hundred twelve".