21007046250 has 140 divisors (see below), whose sum is σ = 59038965546. Its totient is φ = 5601636000.

The previous prime is 21007046213. The next prime is 21007046279. The reversal of 21007046250 is 5264070012.

It can be written as a sum of positive squares in 5 ways, for example, as 1272134889 + 19734911361 = 35667^2 + 140481^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 69 ways as a sum of consecutive naturals, for example, 899724 + ... + 922776.

Almost surely, 2^21007046250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21007046250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29519482773).

21007046250 is an abundant number, since it is smaller than the sum of its proper divisors (38031919296).

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

21007046250 is an frugal number, since it uses more digits than its factorization.

21007046250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23093 (or 23063 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The spelling of 21007046250 in words is "twenty-one billion, seven million, forty-six thousand, two hundred fifty".