21013414402 has 4 divisors (see below), whose sum is σ = 31520121606. Its totient is φ = 10506707200.

The previous prime is 21013414369. The next prime is 21013414427. The reversal of 21013414402 is 20441431012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15205602721 + 5807811681 = 123311^2 + 76209^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253353599 + ... + 5253353602.

Almost surely, 2^21013414402 is an apocalyptic number.

21013414402 is a deficient number, since it is larger than the sum of its proper divisors (10506707204).

21013414402 is a wasteful number, since it uses less digits than its factorization.

21013414402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506707203.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21013414402 its reverse (20441431012), we get a palindrome (41454845414).

The spelling of 21013414402 in words is "twenty-one billion, thirteen million, four hundred fourteen thousand, four hundred two".