21600161955 has 12 divisors (see below), whose sum is σ = 37440280800. Its totient is φ = 11520086352.

The previous prime is 21600161941. The next prime is 21600161969. The reversal of 21600161955 is 55916100612.

21600161955 is a `hidden beast` number, since 21 + 600 + 16 + 19 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21600161941) and next prime (21600161969).

It is not a de Polignac number, because 21600161955 - 2⁴ = 21600161939 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240001755 + ... + 240001844.

It is an arithmetic number, because the mean of its divisors is an integer number (3120023400).

Almost surely, 2^21600161955 is an apocalyptic number.

21600161955 is a deficient number, since it is larger than the sum of its proper divisors (15840118845).

21600161955 is a wasteful number, since it uses less digits than its factorization.

21600161955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480003610 (or 480003607 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 21600161955 in words is "twenty-one billion, six hundred million, one hundred sixty-one thousand, nine hundred fifty-five".