21699100513 has 4 divisors (see below), whose sum is σ = 21700961968. Its totient is φ = 21697239060.

The previous prime is 21699100471. The next prime is 21699100517. The reversal of 21699100513 is 31500199612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21699100513 - 2⁹ = 21699100001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21699100517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913131 + ... + 936592.

It is an arithmetic number, because the mean of its divisors is an integer number (5425240492).

Almost surely, 2^21699100513 is an apocalyptic number.

It is an amenable number.

21699100513 is a deficient number, since it is larger than the sum of its proper divisors (1861455).

21699100513 is a wasteful number, since it uses less digits than its factorization.

21699100513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861454.

The product of its (nonzero) digits is 14580, while the sum is 37.

The spelling of 21699100513 in words is "twenty-one billion, six hundred ninety-nine million, one hundred thousand, five hundred thirteen".