21949735107 has 18 divisors (see below), whose sum is σ = 30602314372. Its totient is φ = 13993168904.

The previous prime is 21949735091. The next prime is 21949735139. The reversal of 21949735107 is 70153794912.

It is not a de Polignac number, because 21949735107 - 2⁴ = 21949735091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21949735207) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5900194 + ... + 5903912.

Almost surely, 2^21949735107 is an apocalyptic number.

21949735107 is a deficient number, since it is larger than the sum of its proper divisors (8652579265).

21949735107 is an frugal number, since it uses more digits than its factorization.

21949735107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7487 (or 3745 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 48.

Multiplying 21949735107 by its sum of digits (48), we get a square (1053587285136 = 1026444²).

The spelling of 21949735107 in words is "twenty-one billion, nine hundred forty-nine million, seven hundred thirty-five thousand, one hundred seven".