21131022142440 has 128 divisors (see below), whose sum is σ = 80499132000000. Its totient is φ = 4829947916544.

The previous prime is 21131022142403. The next prime is 21131022142441. The reversal of 21131022142440 is 4424122013112.

21131022142440 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 1 + 0 + 2 + 214 + 2 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21131022142441) 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, 1397546815 + ... + 1397561934.

It is an arithmetic number, because the mean of its divisors is an integer number (628899468750).

Almost surely, 2^{21131022142440} is an apocalyptic number.

21131022142440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131022142440 is an abundant number, since it is smaller than the sum of its proper divisors (59368109857560).

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

21131022142440 is a wasteful number, since it uses less digits than its factorization.

21131022142440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795108776 (or 2795108766 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21131022142440 its reverse (4424122013112), we get a palindrome (25555144155552).

The spelling of 21131022142440 in words is "twenty-one trillion, one hundred thirty-one billion, twenty-two million, one hundred forty-two thousand, four hundred forty".