21120021220022 has 16 divisors (see below), whose sum is σ = 32128328387232. Its totient is φ = 10411406304000.

The previous prime is 21120021220019. The next prime is 21120021220033. The reversal of 21120021220022 is 22002212002112.

It is a happy number.

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, 206918729 + ... + 207020772.

It is an arithmetic number, because the mean of its divisors is an integer number (2008020524202).

Almost surely, 2^{21120021220022} is an apocalyptic number.

21120021220022 is a deficient number, since it is larger than the sum of its proper divisors (11008307167210).

21120021220022 is a wasteful number, since it uses less digits than its factorization.

21120021220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413939863.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21120021220022 its reverse (22002212002112), we get a palindrome (43122233222134).

The spelling of 21120021220022 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, two hundred twenty thousand, twenty-two".