21323123002 has 4 divisors (see below), whose sum is σ = 31984684506. Its totient is φ = 10661561500.

The previous prime is 21323122993. The next prime is 21323123033. The reversal of 21323123002 is 20032132312.

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., 11504493081 + 9818629921 = 107259^2 + 99089^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330780749 + ... + 5330780752.

Almost surely, 2^21323123002 is an apocalyptic number.

21323123002 is a deficient number, since it is larger than the sum of its proper divisors (10661561504).

21323123002 is a wasteful number, since it uses less digits than its factorization.

21323123002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661561503.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21323123002 its reverse (20032132312), we get a palindrome (41355255314).

The spelling of 21323123002 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty-three thousand, two".