21295004250 has 128 divisors (see below), whose sum is σ = 59730338304. Its totient is φ = 5013888000.

The previous prime is 21295004233. The next prime is 21295004257. The reversal of 21295004250 is 5240059212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21295004257) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 176770 + ... + 271730.

It is an arithmetic number, because the mean of its divisors is an integer number (466643268).

Almost surely, 2^21295004250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21295004250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29865169152).

21295004250 is an abundant number, since it is smaller than the sum of its proper divisors (38435334054).

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

21295004250 is a wasteful number, since it uses less digits than its factorization.

21295004250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95017 (or 95007 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 21295004250 in words is "twenty-one billion, two hundred ninety-five million, four thousand, two hundred fifty".