21345131740 has 24 divisors (see below), whose sum is σ = 44830749600. Its totient is φ = 8536915008.

The previous prime is 21345131701. The next prime is 21345131741. The reversal of 21345131740 is 4713154312.

It is a super-2 number, since 2×21345131740² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345131741) 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, 91849 + ... + 226111.

It is an arithmetic number, because the mean of its divisors is an integer number (1867947900).

Almost surely, 2^21345131740 is an apocalyptic number.

21345131740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21345131740 is an abundant number, since it is smaller than the sum of its proper divisors (23485617860).

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

21345131740 is a wasteful number, since it uses less digits than its factorization.

21345131740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142221 (or 142219 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 21345131740 in words is "twenty-one billion, three hundred forty-five million, one hundred thirty-one thousand, seven hundred forty".