21021121120012 has 24 divisors (see below), whose sum is σ = 39655606410000. Its totient is φ = 9692534723136.

The previous prime is 21021121119931. The next prime is 21021121120019. The reversal of 21021121120012 is 21002112112012.

It is a super-2 number, since 2×21021121120012² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21021121120019) 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, 198304387 + ... + 198410362.

It is an arithmetic number, because the mean of its divisors is an integer number (1652316933750).

Almost surely, 2^{21021121120012} is an apocalyptic number.

It is an amenable number.

21021121120012 is a deficient number, since it is larger than the sum of its proper divisors (18634485289988).

21021121120012 is a wasteful number, since it uses less digits than its factorization.

21021121120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396715785 (or 396715783 counting only the distinct ones).

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

Adding to 21021121120012 its reverse (21002112112012), we get a palindrome (42023233232024).

The spelling of 21021121120012 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, twelve".