21315643156140 has 48 divisors (see below), whose sum is σ = 59691604946400. Its totient is φ = 5683428259840.

The previous prime is 21315643156117. The next prime is 21315643156183. The reversal of 21315643156140 is 4165134651312.

It is a junction number, because it is equal to n+sod(n) for n = 21315643156092 and 21315643156101.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22763751 + ... + 23681630.

It is an arithmetic number, because the mean of its divisors is an integer number (1243575103050).

Almost surely, 2^{21315643156140} is an apocalyptic number.

21315643156140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21315643156140 is an abundant number, since it is smaller than the sum of its proper divisors (38375961790260).

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

21315643156140 is a wasteful number, since it uses less digits than its factorization.

21315643156140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46453042 (or 46453040 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 21315643156140 in words is "twenty-one trillion, three hundred fifteen billion, six hundred forty-three million, one hundred fifty-six thousand, one hundred forty".