21611305022156 has 6 divisors (see below), whose sum is σ = 37819783788780. Its totient is φ = 10805652511076.

The previous prime is 21611305022147. The next prime is 21611305022243. The reversal of 21611305022156 is 65122050311612.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2701413127766 + ... + 2701413127773.

It is an arithmetic number, because the mean of its divisors is an integer number (6303297298130).

Almost surely, 2^{21611305022156} is an apocalyptic number.

It is an amenable number.

21611305022156 is a deficient number, since it is larger than the sum of its proper divisors (16208478766624).

21611305022156 is a wasteful number, since it uses less digits than its factorization.

21611305022156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5402826255543 (or 5402826255541 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 21611305022156 its reverse (65122050311612), we get a palindrome (86733355333768).

The spelling of 21611305022156 in words is "twenty-one trillion, six hundred eleven billion, three hundred five million, twenty-two thousand, one hundred fifty-six".