21500672061 has 64 divisors (see below), whose sum is σ = 33374315520. Its totient is φ = 12175349760.

The previous prime is 21500672027. The next prime is 21500672101. The reversal of 21500672061 is 16027600512.

It is not a de Polignac number, because 21500672061 - 2¹⁴ = 21500655677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500672161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28402095 + ... + 28402851.

It is an arithmetic number, because the mean of its divisors is an integer number (521473680).

Almost surely, 2^21500672061 is an apocalyptic number.

It is an amenable number.

21500672061 is a deficient number, since it is larger than the sum of its proper divisors (11873643459).

21500672061 is a wasteful number, since it uses less digits than its factorization.

21500672061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354.

The product of its (nonzero) digits is 5040, while the sum is 30.

The spelling of 21500672061 in words is "twenty-one billion, five hundred million, six hundred seventy-two thousand, sixty-one".