21014012154 has 32 divisors (see below), whose sum is σ = 44652202560. Its totient is φ = 6570121472.

The previous prime is 21014012099. The next prime is 21014012231. The reversal of 21014012154 is 45121041012.

It is a self number, because there is not a number n which added to its sum of digits gives 21014012154.

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, 321684 + ... + 381455.

It is an arithmetic number, because the mean of its divisors is an integer number (1395381330).

Almost surely, 2^21014012154 is an apocalyptic number.

21014012154 is an abundant number, since it is smaller than the sum of its proper divisors (23638190406).

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

21014012154 is a wasteful number, since it uses less digits than its factorization.

21014012154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703454.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21014012154 its reverse (45121041012), we get a palindrome (66135053166).

The spelling of 21014012154 in words is "twenty-one billion, fourteen million, twelve thousand, one hundred fifty-four".