21210131210320 has 160 divisors (see below), whose sum is σ = 58332528979200. Its totient is φ = 7096676032512.

The previous prime is 21210131210299. The next prime is 21210131210321. The reversal of 21210131210320 is 2301213101212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210131210321) 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, 22880025 + ... + 23788984.

It is an arithmetic number, because the mean of its divisors is an integer number (364578306120).

Almost surely, 2^{21210131210320} is an apocalyptic number.

21210131210320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210131210320 is an abundant number, since it is smaller than the sum of its proper divisors (37122397768880).

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

21210131210320 is a wasteful number, since it uses less digits than its factorization.

21210131210320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46669077 (or 46669071 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21210131210320 its reverse (2301213101212), we get a palindrome (23511344311532).

It can be divided in two parts, 2121013 and 1210320, that added together give a palindrome (3331333).

The spelling of 21210131210320 in words is "twenty-one trillion, two hundred ten billion, one hundred thirty-one million, two hundred ten thousand, three hundred twenty".