21013052402 has 32 divisors (see below), whose sum is σ = 34930341504. Its totient is φ = 9429868800.

The previous prime is 21013052339. The next prime is 21013052447. The reversal of 21013052402 is 20425031012.

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, 218252 + ... + 299432.

It is an arithmetic number, because the mean of its divisors is an integer number (1091573172).

Almost surely, 2^21013052402 is an apocalyptic number.

21013052402 is a deficient number, since it is larger than the sum of its proper divisors (13917289102).

21013052402 is a wasteful number, since it uses less digits than its factorization.

21013052402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81554.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21013052402 its reverse (20425031012), we get a palindrome (41438083414).

It can be divided in two parts, 2101 and 3052402, that added together give a palindrome (3054503).

The spelling of 21013052402 in words is "twenty-one billion, thirteen million, fifty-two thousand, four hundred two".