21250156140 has 96 divisors (see below), whose sum is σ = 66408437760. Its totient is φ = 5641265088.

The previous prime is 21250156133. The next prime is 21250156177. The reversal of 21250156140 is 4165105212.

21250156140 is a `hidden beast` number, since 2 + 12 + 50 + 1 + 561 + 40 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32187 + ... + 208653.

It is an arithmetic number, because the mean of its divisors is an integer number (691754560).

Almost surely, 2^21250156140 is an apocalyptic number.

21250156140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21250156140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33204218880).

21250156140 is an abundant number, since it is smaller than the sum of its proper divisors (45158281620).

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

21250156140 is a wasteful number, since it uses less digits than its factorization.

21250156140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176708 (or 176700 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 21250156140 in words is "twenty-one billion, two hundred fifty million, one hundred fifty-six thousand, one hundred forty".