21969013385 has 32 divisors (see below), whose sum is σ = 31775162112. Its totient is φ = 14383790080.

The previous prime is 21969013379. The next prime is 21969013393. The reversal of 21969013385 is 58331096912.

It is not a de Polignac number, because 21969013385 - 2³⁰ = 20895271561 is a prime.

It is a super-2 number, since 2×21969013385² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 489284 + ... + 532293.

It is an arithmetic number, because the mean of its divisors is an integer number (992973816).

Almost surely, 2^21969013385 is an apocalyptic number.

It is an amenable number.

21969013385 is a deficient number, since it is larger than the sum of its proper divisors (9806148727).

21969013385 is a wasteful number, since it uses less digits than its factorization.

21969013385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021633.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 21969013385 in words is "twenty-one billion, nine hundred sixty-nine million, thirteen thousand, three hundred eighty-five".