21302131302 has 16 divisors (see below), whose sum is σ = 47338069680. Its totient is φ = 7100710416.

The previous prime is 21302131223. The next prime is 21302131303. The reversal of 21302131302 is 20313120312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302131303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197241903 + ... + 197242010.

It is an arithmetic number, because the mean of its divisors is an integer number (2958629355).

Almost surely, 2^21302131302 is an apocalyptic number.

21302131302 is an abundant number, since it is smaller than the sum of its proper divisors (26035938378).

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

21302131302 is a wasteful number, since it uses less digits than its factorization.

21302131302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394483924 (or 394483918 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21302131302 its reverse (20313120312), we get a palindrome (41615251614).

The spelling of 21302131302 in words is "twenty-one billion, three hundred two million, one hundred thirty-one thousand, three hundred two".