221379232136 has 8 divisors (see below), whose sum is σ = 415086060270. Its totient is φ = 110689616064.

The previous prime is 221379232121. The next prime is 221379232157. The reversal of 221379232136 is 631232973122.

It can be written as a sum of positive squares in only one way, i.e., 127810540036 + 93568692100 = 357506^2 + 305890^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×221379232136² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221379232093 and 221379232102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13836202001 + ... + 13836202016.

Almost surely, 2^221379232136 is an apocalyptic number.

It is an amenable number.

221379232136 is a deficient number, since it is larger than the sum of its proper divisors (193706828134).

221379232136 is a wasteful number, since it uses less digits than its factorization.

221379232136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27672404023 (or 27672404019 counting only the distinct ones).

The product of its digits is 163296, while the sum is 41.

The spelling of 221379232136 in words is "two hundred twenty-one billion, three hundred seventy-nine million, two hundred thirty-two thousand, one hundred thirty-six".