21135022156 has 6 divisors (see below), whose sum is σ = 36986288780. Its totient is φ = 10567511076.

The previous prime is 21135022127. The next prime is 21135022171. The reversal of 21135022156 is 65122053112.

It is a super-2 number, since 2×21135022156² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641877766 + ... + 2641877773.

Almost surely, 2^21135022156 is an apocalyptic number.

It is an amenable number.

21135022156 is a deficient number, since it is larger than the sum of its proper divisors (15851266624).

21135022156 is a wasteful number, since it uses less digits than its factorization.

21135022156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283755543 (or 5283755541 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 21135022156 its reverse (65122053112), we get a palindrome (86257075268).

The spelling of 21135022156 in words is "twenty-one billion, one hundred thirty-five million, twenty-two thousand, one hundred fifty-six".