21655536122 has 16 divisors (see below), whose sum is σ = 37520822592. Its totient is φ = 9264400320.

The previous prime is 21655536073. The next prime is 21655536143. The reversal of 21655536122 is 22163555612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28950878 + ... + 28951625.

It is an arithmetic number, because the mean of its divisors is an integer number (2345051412).

Almost surely, 2^21655536122 is an apocalyptic number.

21655536122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21655536122 is a deficient number, since it is larger than the sum of its proper divisors (15865286470).

21655536122 is a wasteful number, since it uses less digits than its factorization.

21655536122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57902533.

The product of its digits is 108000, while the sum is 38.

The spelling of 21655536122 in words is "twenty-one billion, six hundred fifty-five million, five hundred thirty-six thousand, one hundred twenty-two".