21402304402 has 8 divisors (see below), whose sum is σ = 33499259136. Its totient is φ = 10235884692.

The previous prime is 21402304373. The next prime is 21402304409. The reversal of 21402304402 is 20440320412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21402304409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232633698 + ... + 232633789.

It is an arithmetic number, because the mean of its divisors is an integer number (4187407392).

Almost surely, 2^21402304402 is an apocalyptic number.

21402304402 is a deficient number, since it is larger than the sum of its proper divisors (12096954734).

21402304402 is a wasteful number, since it uses less digits than its factorization.

21402304402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465267512.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21402304402 its reverse (20440320412), we get a palindrome (41842624814).

The spelling of 21402304402 in words is "twenty-one billion, four hundred two million, three hundred four thousand, four hundred two".