21314967993 has 20 divisors (see below), whose sum is σ = 34735504848. Its totient is φ = 12918161880.

The previous prime is 21314967977. The next prime is 21314968001. The reversal of 21314967993 is 39976941312.

It is a happy number.

It is not a de Polignac number, because 21314967993 - 2⁴ = 21314967977 is a prime.

It is a super-2 number, since 2×21314967993² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21314967913) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11960371 + ... + 11962152.

Almost surely, 2^21314967993 is an apocalyptic number.

It is an amenable number.

21314967993 is a deficient number, since it is larger than the sum of its proper divisors (13420536855).

21314967993 is a wasteful number, since it uses less digits than its factorization.

21314967993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23922546 (or 23922537 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The spelling of 21314967993 in words is "twenty-one billion, three hundred fourteen million, nine hundred sixty-seven thousand, nine hundred ninety-three".