21401012304 has 120 divisors (see below), whose sum is σ = 68622968960. Its totient is φ = 6099058944.

The previous prime is 21401012293. The next prime is 21401012333. The reversal of 21401012304 is 40321010412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 373437 + ... + 426915.

Almost surely, 2^21401012304 is an apocalyptic number.

21401012304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21401012304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34311484480).

21401012304 is an abundant number, since it is smaller than the sum of its proper divisors (47221956656).

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

21401012304 is a wasteful number, since it uses less digits than its factorization.

21401012304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53897 (or 53888 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21401012304 its reverse (40321010412), we get a palindrome (61722022716).

The spelling of 21401012304 in words is "twenty-one billion, four hundred one million, twelve thousand, three hundred four".