21261335354 has 16 divisors (see below), whose sum is σ = 36450590976. Its totient is φ = 9111354000.

The previous prime is 21261335323. The next prime is 21261335377. The reversal of 21261335354 is 45353316212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187679 + ... + 278829.

It is an arithmetic number, because the mean of its divisors is an integer number (2278161936).

Almost surely, 2^21261335354 is an apocalyptic number.

21261335354 is a deficient number, since it is larger than the sum of its proper divisors (15189255622).

21261335354 is a wasteful number, since it uses less digits than its factorization.

21261335354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107821.

The product of its digits is 64800, while the sum is 35.

The spelling of 21261335354 in words is "twenty-one billion, two hundred sixty-one million, three hundred thirty-five thousand, three hundred fifty-four".