21915850671 has 32 divisors (see below), whose sum is σ = 38144144640. Its totient is φ = 12260613600.

The previous prime is 21915850669. The next prime is 21915850703. The reversal of 21915850671 is 17605851912.

21915850671 is a `hidden beast` number, since 2 + 1 + 9 + 1 + 585 + 0 + 67 + 1 = 666.

It is not a de Polignac number, because 21915850671 - 2¹ = 21915850669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21915850601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2834245 + ... + 2841966.

It is an arithmetic number, because the mean of its divisors is an integer number (1192004520).

Almost surely, 2^21915850671 is an apocalyptic number.

21915850671 is a deficient number, since it is larger than the sum of its proper divisors (16228293969).

21915850671 is a wasteful number, since it uses less digits than its factorization.

21915850671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5676244 (or 5676238 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 45.

The spelling of 21915850671 in words is "twenty-one billion, nine hundred fifteen million, eight hundred fifty thousand, six hundred seventy-one".