21500055605061 has 32 divisors (see below), whose sum is σ = 36258328304640. Its totient is φ = 12463800346800.

The previous prime is 21500055605053. The next prime is 21500055605081. The reversal of 21500055605061 is 16050655000512.

21500055605061 is a `hidden beast` number, since 2 + 1 + 50 + 0 + 0 + 556 + 0 + 50 + 6 + 1 = 666.

It is not a de Polignac number, because 21500055605061 - 2³ = 21500055605053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500055605081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1573705335 + ... + 1573718996.

It is an arithmetic number, because the mean of its divisors is an integer number (1133072759520).

Almost surely, 2^{21500055605061} is an apocalyptic number.

It is an amenable number.

21500055605061 is a deficient number, since it is larger than the sum of its proper divisors (14758272699579).

21500055605061 is a wasteful number, since it uses less digits than its factorization.

21500055605061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3147424374 (or 3147424368 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 21500055605061 in words is "twenty-one trillion, five hundred billion, fifty-five million, six hundred five thousand, sixty-one".