21713153706 has 24 divisors (see below), whose sum is σ = 48787581024. Its totient is φ = 7237717740.

The previous prime is 21713153699. The next prime is 21713153717. The reversal of 21713153706 is 60735131712.

21713153706 is a `hidden beast` number, since 21 + 71 + 31 + 537 + 0 + 6 = 666.

It is a super-2 number, since 2×21713153706² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22338150 + ... + 22339121.

It is an arithmetic number, because the mean of its divisors is an integer number (2032815876).

Almost surely, 2^21713153706 is an apocalyptic number.

21713153706 is an abundant number, since it is smaller than the sum of its proper divisors (27074427318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21713153706 is an equidigital number, since it uses as much as digits as its factorization.

21713153706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44677288 (or 44677276 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The spelling of 21713153706 in words is "twenty-one billion, seven hundred thirteen million, one hundred fifty-three thousand, seven hundred six".