21953752407 has 16 divisors (see below), whose sum is σ = 34235872000. Its totient is φ = 13865527512.

The previous prime is 21953752397. The next prime is 21953752421. The reversal of 21953752407 is 70425735912.

It is a happy number.

21953752407 is a `hidden beast` number, since 2 + 1 + 95 + 37 + 524 + 0 + 7 = 666.

It is not a de Polignac number, because 21953752407 - 2⁶ = 21953752343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21953752427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21396907 + ... + 21397932.

It is an arithmetic number, because the mean of its divisors is an integer number (2139742000).

Almost surely, 2^21953752407 is an apocalyptic number.

21953752407 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21953752407 is a deficient number, since it is larger than the sum of its proper divisors (12282119593).

21953752407 is a wasteful number, since it uses less digits than its factorization.

21953752407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42794867 (or 42794861 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 21953752407 in words is "twenty-one billion, nine hundred fifty-three million, seven hundred fifty-two thousand, four hundred seven".