21713397061 has 16 divisors (see below), whose sum is σ = 22519684800. Its totient is φ = 20922498688.

The previous prime is 21713397059. The next prime is 21713397077. The reversal of 21713397061 is 16079331712.

It is a cyclic number.

It is not a de Polignac number, because 21713397061 - 2¹ = 21713397059 is a prime.

It is a super-2 number, since 2×21713397061² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21713397161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4028010 + ... + 4033396.

It is an arithmetic number, because the mean of its divisors is an integer number (1407480300).

Almost surely, 2^21713397061 is an apocalyptic number.

It is an amenable number.

21713397061 is a deficient number, since it is larger than the sum of its proper divisors (806287739).

21713397061 is a wasteful number, since it uses less digits than its factorization.

21713397061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788.

The product of its (nonzero) digits is 47628, while the sum is 40.

The spelling of 21713397061 in words is "twenty-one billion, seven hundred thirteen million, three hundred ninety-seven thousand, sixty-one".