21320122402 has 4 divisors (see below), whose sum is σ = 31980183606. Its totient is φ = 10660061200.

The previous prime is 21320122349. The next prime is 21320122403. The reversal of 21320122402 is 20422102312.

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., 18684429481 + 2635692921 = 136691^2 + 51339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21320122402.

It is not an unprimeable number, because it can be changed into a prime (21320122403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330030599 + ... + 5330030602.

Almost surely, 2^21320122402 is an apocalyptic number.

21320122402 is a deficient number, since it is larger than the sum of its proper divisors (10660061204).

21320122402 is a wasteful number, since it uses less digits than its factorization.

21320122402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10660061203.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21320122402 its reverse (20422102312), we get a palindrome (41742224714).

The spelling of 21320122402 in words is "twenty-one billion, three hundred twenty million, one hundred twenty-two thousand, four hundred two".