21214255154 has 16 divisors (see below), whose sum is σ = 33790346208. Its totient is φ = 9954403392.

The previous prime is 21214255109. The next prime is 21214255177. The reversal of 21214255154 is 45155241212.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21214255154.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887264 + ... + 910859.

It is an arithmetic number, because the mean of its divisors is an integer number (2111896638).

Almost surely, 2^21214255154 is an apocalyptic number.

21214255154 is a deficient number, since it is larger than the sum of its proper divisors (12576091054).

21214255154 is a wasteful number, since it uses less digits than its factorization.

21214255154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798489.

The product of its digits is 16000, while the sum is 32.

Adding to 21214255154 its reverse (45155241212), we get a palindrome (66369496366).

The spelling of 21214255154 in words is "twenty-one billion, two hundred fourteen million, two hundred fifty-five thousand, one hundred fifty-four".