221551462064 has 20 divisors (see below), whose sum is σ = 429277267800. Its totient is φ = 110770231680.

The previous prime is 221551462063. The next prime is 221551462091. The reversal of 221551462064 is 460264155122.

It is a super-2 number, since 2×221551462064² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221551462063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989 + ... + 665660.

It is an arithmetic number, because the mean of its divisors is an integer number (21463863390).

Almost surely, 2^221551462064 is an apocalyptic number.

It is an amenable number.

221551462064 is a deficient number, since it is larger than the sum of its proper divisors (207725805736).

221551462064 is a wasteful number, since it uses less digits than its factorization.

221551462064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687428 (or 687422 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 221551462064 in words is "two hundred twenty-one billion, five hundred fifty-one million, four hundred sixty-two thousand, sixty-four".