21221022000012 has 24 divisors (see below), whose sum is σ = 49515808270656. Its totient is φ = 7073661104208.

The previous prime is 21221021999993. The next prime is 21221022000053. The reversal of 21221022000012 is 21000022012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221021999955 and 21221022000000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7149363 + ... + 9672405.

It is an arithmetic number, because the mean of its divisors is an integer number (2063158677944).

Almost surely, 2^{21221022000012} is an apocalyptic number.

It is an amenable number.

21221022000012 is an abundant number, since it is smaller than the sum of its proper divisors (28294786270644).

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

21221022000012 is a wasteful number, since it uses less digits than its factorization.

21221022000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223957 (or 3223955 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21221022000012 its reverse (21000022012212), we get a palindrome (42221044012224).

The spelling of 21221022000012 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two million, twelve", and thus it is an aban number.