21589453951 has 8 divisors (see below), whose sum is σ = 23255460144. Its totient is φ = 19924201920.

The previous prime is 21589453939. The next prime is 21589453967. The reversal of 21589453951 is 15935498512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21589453951 is a prime.

It is a super-2 number, since 2×21589453951² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21589453981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128365 + ... + 244246.

It is an arithmetic number, because the mean of its divisors is an integer number (2906932518).

Almost surely, 2^21589453951 is an apocalyptic number.

21589453951 is a deficient number, since it is larger than the sum of its proper divisors (1666006193).

21589453951 is a wasteful number, since it uses less digits than its factorization.

21589453951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377081.

The product of its digits is 1944000, while the sum is 52.

The spelling of 21589453951 in words is "twenty-one billion, five hundred eighty-nine million, four hundred fifty-three thousand, nine hundred fifty-one".