21440421002 has 48 divisors (see below), whose sum is σ = 43507879296. Its totient is φ = 7710832800.

The previous prime is 21440420999. The next prime is 21440421071. The reversal of 21440421002 is 20012404412.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464774 + ... + 508817.

It is an arithmetic number, because the mean of its divisors is an integer number (906414152).

Almost surely, 2^21440421002 is an apocalyptic number.

21440421002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21440421002 is an abundant number, since it is smaller than the sum of its proper divisors (22067458294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21440421002 is a wasteful number, since it uses less digits than its factorization.

21440421002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973635 (or 973624 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21440421002 its reverse (20012404412), we get a palindrome (41452825414).

The spelling of 21440421002 in words is "twenty-one billion, four hundred forty million, four hundred twenty-one thousand, two".