21154414356 has 48 divisors (see below), whose sum is σ = 56735985600. Its totient is φ = 6808316256.

The previous prime is 21154414331. The next prime is 21154414397. The reversal of 21154414356 is 65341445112.

21154414356 is a `hidden beast` number, since 21 + 1 + 544 + 1 + 43 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21154414356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3374010 + ... + 3380273.

It is an arithmetic number, because the mean of its divisors is an integer number (1181999700).

Almost surely, 2^21154414356 is an apocalyptic number.

It is an amenable number.

21154414356 is an abundant number, since it is smaller than the sum of its proper divisors (35581571244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154414356 is a wasteful number, since it uses less digits than its factorization.

21154414356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6754325 (or 6754317 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

Adding to 21154414356 its reverse (65341445112), we get a palindrome (86495859468).

The spelling of 21154414356 in words is "twenty-one billion, one hundred fifty-four million, four hundred fourteen thousand, three hundred fifty-six".