21386551454 has 8 divisors (see below), whose sum is σ = 32181026328. Its totient is φ = 10659542680.

The previous prime is 21386551453. The next prime is 21386551469. The reversal of 21386551454 is 45415568312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21386551451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16865732 + ... + 16866999.

It is an arithmetic number, because the mean of its divisors is an integer number (4022628291).

Almost surely, 2^21386551454 is an apocalyptic number.

21386551454 is a deficient number, since it is larger than the sum of its proper divisors (10794474874).

21386551454 is a wasteful number, since it uses less digits than its factorization.

21386551454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33733050.

The product of its digits is 576000, while the sum is 44.

The spelling of 21386551454 in words is "twenty-one billion, three hundred eighty-six million, five hundred fifty-one thousand, four hundred fifty-four".