21331031302 has 32 divisors (see below), whose sum is σ = 38561460480. Its totient is φ = 8645110560.

The previous prime is 21331031297. The next prime is 21331031363. The reversal of 21331031302 is 20313013312.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21331031302.

It is a congruent number.

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, 76177 + ... + 220147.

It is an arithmetic number, because the mean of its divisors is an integer number (1205045640).

Almost surely, 2^21331031302 is an apocalyptic number.

21331031302 is a deficient number, since it is larger than the sum of its proper divisors (17230429178).

21331031302 is a wasteful number, since it uses less digits than its factorization.

21331031302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144556.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21331031302 its reverse (20313013312), we get a palindrome (41644044614).

The spelling of 21331031302 in words is "twenty-one billion, three hundred thirty-one million, thirty-one thousand, three hundred two".