21301321002 has 64 divisors (see below), whose sum is σ = 48410624640. Its totient is φ = 6194361600.

The previous prime is 21301320991. The next prime is 21301321003. The reversal of 21301321002 is 20012310312.

It is not an unprimeable number, because it can be changed into a prime (21301321003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 606852 + ... + 640992.

It is an arithmetic number, because the mean of its divisors is an integer number (756416010).

Almost surely, 2^21301321002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21301321002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24205312320).

21301321002 is an abundant number, since it is smaller than the sum of its proper divisors (27109303638).

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

21301321002 is a wasteful number, since it uses less digits than its factorization.

21301321002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34599.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21301321002 its reverse (20012310312), we get a palindrome (41313631314).

The spelling of 21301321002 in words is "twenty-one billion, three hundred one million, three hundred twenty-one thousand, two".