21907943450 has 24 divisors (see below), whose sum is σ = 40755589020. Its totient is φ = 8761712000.

The previous prime is 21907943441. The next prime is 21907943459. The reversal of 21907943450 is 5434970912.

It is an interprime number because it is at equal distance from previous prime (21907943441) and next prime (21907943459).

It can be written as a sum of positive squares in 6 ways, for example, as 10454449009 + 11453494441 = 102247^2 + 107021^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21907943459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295100 + ... + 361800.

Almost surely, 2^21907943450 is an apocalyptic number.

21907943450 is a deficient number, since it is larger than the sum of its proper divisors (18847645570).

21907943450 is a wasteful number, since it uses less digits than its factorization.

21907943450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73282 (or 73277 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 21907943450 in words is "twenty-one billion, nine hundred seven million, nine hundred forty-three thousand, four hundred fifty".