21004231014 has 80 divisors (see below), whose sum is σ = 50943716208. Its totient is φ = 6429907008.

The previous prime is 21004230931. The next prime is 21004231021. The reversal of 21004231014 is 41013240012.

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 39 ways as a sum of consecutive naturals, for example, 389569 + ... + 440195.

Almost surely, 2^21004231014 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21004231014, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25471858104).

21004231014 is an abundant number, since it is smaller than the sum of its proper divisors (29939485194).

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

21004231014 is a wasteful number, since it uses less digits than its factorization.

21004231014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50851 (or 50842 counting only the distinct ones).

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

Adding to 21004231014 its reverse (41013240012), we get a palindrome (62017471026).

The spelling of 21004231014 in words is "twenty-one billion, four million, two hundred thirty-one thousand, fourteen".