21324010402 has 4 divisors (see below), whose sum is σ = 31986015606. Its totient is φ = 10662005200.

The previous prime is 21324010397. The next prime is 21324010451. The reversal of 21324010402 is 20401042312.

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., 11376142281 + 9947868121 = 106659^2 + 99739^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21324010402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331002599 + ... + 5331002602.

Almost surely, 2^21324010402 is an apocalyptic number.

21324010402 is a deficient number, since it is larger than the sum of its proper divisors (10662005204).

21324010402 is a wasteful number, since it uses less digits than its factorization.

21324010402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10662005203.

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

Adding to 21324010402 its reverse (20401042312), we get a palindrome (41725052714).

It can be divided in two parts, 21 and 324010402, that added together give a palindrome (324010423).

The spelling of 21324010402 in words is "twenty-one billion, three hundred twenty-four million, ten thousand, four hundred two".