21420403202 has 32 divisors (see below), whose sum is σ = 35252029440. Its totient is φ = 9680992720.

The previous prime is 21420403159. The next prime is 21420403241. The reversal of 21420403202 is 20230402412.

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, 3903953 + ... + 3909435.

It is an arithmetic number, because the mean of its divisors is an integer number (1101625920).

Almost surely, 2^21420403202 is an apocalyptic number.

21420403202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21420403202 is a deficient number, since it is larger than the sum of its proper divisors (13831626238).

21420403202 is a wasteful number, since it uses less digits than its factorization.

21420403202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6478.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21420403202 its reverse (20230402412), we get a palindrome (41650805614).

The spelling of 21420403202 in words is "twenty-one billion, four hundred twenty million, four hundred three thousand, two hundred two".