21021122121022 has 16 divisors (see below), whose sum is σ = 31671460788912. Its totient is φ = 10464005968000.

The previous prime is 21021122120993. The next prime is 21021122121079. The reversal of 21021122121022 is 22012122112012.

It is a congruent number.

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, 8236603 + ... + 10482550.

It is an arithmetic number, because the mean of its divisors is an integer number (1979466299307).

Almost surely, 2^{21021122121022} is an apocalyptic number.

21021122121022 is a deficient number, since it is larger than the sum of its proper divisors (10650338667890).

21021122121022 is a wasteful number, since it uses less digits than its factorization.

21021122121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18721643.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021122121022 its reverse (22012122112012), we get a palindrome (43033244233034).

The spelling of 21021122121022 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-two".