21110021222012 has 36 divisors (see below), whose sum is σ = 39477780321840. Its totient is φ = 9842988471552.

The previous prime is 21110021221951. The next prime is 21110021222039. The reversal of 21110021222012 is 21022212001112.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12256712 + ... + 13872527.

It is an arithmetic number, because the mean of its divisors is an integer number (1096605008940).

Almost surely, 2^{21110021222012} is an apocalyptic number.

It is an amenable number.

21110021222012 is a deficient number, since it is larger than the sum of its proper divisors (18367759099828).

21110021222012 is a wasteful number, since it uses less digits than its factorization.

21110021222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26129478 (or 26129367 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21110021222012 its reverse (21022212001112), we get a palindrome (42132233223124).

The spelling of 21110021222012 in words is "twenty-one trillion, one hundred ten billion, twenty-one million, two hundred twenty-two thousand, twelve".