21210231023140 has 48 divisors (see below), whose sum is σ = 48787833654000. Its totient is φ = 7709682348032.

The previous prime is 21210231023087. The next prime is 21210231023141. The reversal of 21210231023140 is 4132013201212.

It can be written as a sum of positive squares in 8 ways, for example, as 2264808285184 + 18945422737956 = 1504928^2 + 4352634^2 .

It is not an unprimeable number, because it can be changed into a prime (21210231023141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1075559665 + ... + 1075579384.

It is an arithmetic number, because the mean of its divisors is an integer number (1016413201125).

Almost surely, 2^{21210231023140} is an apocalyptic number.

21210231023140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210231023140 is an abundant number, since it is smaller than the sum of its proper divisors (27577602630860).

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

21210231023140 is a wasteful number, since it uses less digits than its factorization.

21210231023140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151139104 (or 2151139102 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21210231023140 its reverse (4132013201212), we get a palindrome (25342244224352).

The spelling of 21210231023140 in words is "twenty-one trillion, two hundred ten billion, two hundred thirty-one million, twenty-three thousand, one hundred forty".