21494935407 has 32 divisors (see below), whose sum is σ = 33240347136. Its totient is φ = 12225699200.

The previous prime is 21494935381. The next prime is 21494935421. The reversal of 21494935407 is 70453949412.

It is not a de Polignac number, because 21494935407 - 2¹⁴ = 21494919023 is a prime.

It is a super-2 number, since 2×21494935407² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494935447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226944 + ... + 307397.

It is an arithmetic number, because the mean of its divisors is an integer number (1038760848).

Almost surely, 2^21494935407 is an apocalyptic number.

21494935407 is a deficient number, since it is larger than the sum of its proper divisors (11745411729).

21494935407 is a wasteful number, since it uses less digits than its factorization.

21494935407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534431.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 21494935407 in words is "twenty-one billion, four hundred ninety-four million, nine hundred thirty-five thousand, four hundred seven".