21698803124957 has 16 divisors (see below), whose sum is σ = 26274962414592. Its totient is φ = 17493192003840.

The previous prime is 21698803124953. The next prime is 21698803124963. The reversal of 21698803124957 is 75942130889612.

It is not a de Polignac number, because 21698803124957 - 2² = 21698803124953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21698803124893 and 21698803124902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21698803124953) 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, 60888269 + ... + 61243602.

It is an arithmetic number, because the mean of its divisors is an integer number (1642185150912).

It is a 1-persistent number, because it is pandigital, but 2⋅21698803124957 = 43397606249914 is not.

Almost surely, 2^{21698803124957} is an apocalyptic number.

It is an amenable number.

21698803124957 is a deficient number, since it is larger than the sum of its proper divisors (4576159289635).

21698803124957 is a wasteful number, since it uses less digits than its factorization.

21698803124957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122133388.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 21698803124957 in words is "twenty-one trillion, six hundred ninety-eight billion, eight hundred three million, one hundred twenty-four thousand, nine hundred fifty-seven".