21501045351 has 16 divisors (see below), whose sum is σ = 31916747520. Its totient is φ = 14305524120.

The previous prime is 21501045329. The next prime is 21501045383. The reversal of 21501045351 is 15354010512.

21501045351 is a `hidden beast` number, since 2 + 150 + 10 + 453 + 51 = 666.

It is not a de Polignac number, because 21501045351 - 2²⁶ = 21433936487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21501045451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 778005 + ... + 805166.

It is an arithmetic number, because the mean of its divisors is an integer number (1994796720).

Almost surely, 2^21501045351 is an apocalyptic number.

21501045351 is a deficient number, since it is larger than the sum of its proper divisors (10415702169).

21501045351 is a wasteful number, since it uses less digits than its factorization.

21501045351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583683 (or 1583677 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 21501045351 its reverse (15354010512), we get a palindrome (36855055863).

The spelling of 21501045351 in words is "twenty-one billion, five hundred one million, forty-five thousand, three hundred fifty-one".