21146342740 has 24 divisors (see below), whose sum is σ = 44410988160. Its totient is φ = 8457838368.

The previous prime is 21146342713. The next prime is 21146342753. The reversal of 21146342740 is 4724364112.

It is a super-2 number, since 2×21146342740² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21146342696 and 21146342705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253969 + ... + 326791.

It is an arithmetic number, because the mean of its divisors is an integer number (1850457840).

Almost surely, 2^21146342740 is an apocalyptic number.

21146342740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21146342740 is an abundant number, since it is smaller than the sum of its proper divisors (23264645420).

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

21146342740 is a wasteful number, since it uses less digits than its factorization.

21146342740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87351 (or 87349 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The spelling of 21146342740 in words is "twenty-one billion, one hundred forty-six million, three hundred forty-two thousand, seven hundred forty".