21355420311122 has 32 divisors (see below), whose sum is σ = 33080439744000. Its totient is φ = 10333197641088.

The previous prime is 21355420311091. The next prime is 21355420311131. The reversal of 21355420311122 is 22111302455312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247421078 + ... + 247507374.

It is an arithmetic number, because the mean of its divisors is an integer number (1033763742000).

Almost surely, 2^{21355420311122} is an apocalyptic number.

21355420311122 is a deficient number, since it is larger than the sum of its proper divisors (11725019432878).

21355420311122 is a wasteful number, since it uses less digits than its factorization.

21355420311122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112850.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21355420311122 its reverse (22111302455312), we get a palindrome (43466722766434).

The spelling of 21355420311122 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred twenty million, three hundred eleven thousand, one hundred twenty-two".