21044331502 has 8 divisors (see below), whose sum is σ = 31569602616. Its totient is φ = 10521130632.

The previous prime is 21044331499. The next prime is 21044331521. The reversal of 21044331502 is 20513344012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 491893 + ... + 532960.

It is an arithmetic number, because the mean of its divisors is an integer number (3946200327).

Almost surely, 2^21044331502 is an apocalyptic number.

21044331502 is a deficient number, since it is larger than the sum of its proper divisors (10525271114).

21044331502 is a wasteful number, since it uses less digits than its factorization.

21044331502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035122.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21044331502 its reverse (20513344012), we get a palindrome (41557675514).

The spelling of 21044331502 in words is "twenty-one billion, forty-four million, three hundred thirty-one thousand, five hundred two".