21401420204 has 6 divisors (see below), whose sum is σ = 37452485364. Its totient is φ = 10700710100.

The previous prime is 21401420177. The next prime is 21401420251. The reversal of 21401420204 is 40202410412.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675177522 + ... + 2675177529.

It is an arithmetic number, because the mean of its divisors is an integer number (6242080894).

Almost surely, 2^21401420204 is an apocalyptic number.

It is an amenable number.

21401420204 is a deficient number, since it is larger than the sum of its proper divisors (16051065160).

21401420204 is a wasteful number, since it uses less digits than its factorization.

21401420204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350355055 (or 5350355053 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21401420204 its reverse (40202410412), we get a palindrome (61603830616).

The spelling of 21401420204 in words is "twenty-one billion, four hundred one million, four hundred twenty thousand, two hundred four".