21403213104 has 80 divisors (see below), whose sum is σ = 68051255552. Its totient is φ = 5644802304.

The previous prime is 21403213087. The next prime is 21403213123. The reversal of 21403213104 is 40131230412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2445634 + ... + 2454369.

Almost surely, 2^21403213104 is an apocalyptic number.

21403213104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21403213104 is an abundant number, since it is smaller than the sum of its proper divisors (46648042448).

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

21403213104 is a wasteful number, since it uses less digits than its factorization.

21403213104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900034 (or 4900028 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21403213104 its reverse (40131230412), we get a palindrome (61534443516).

The spelling of 21403213104 in words is "twenty-one billion, four hundred three million, two hundred thirteen thousand, one hundred four".