21258110850 has 24 divisors (see below), whose sum is σ = 52720115280. Its totient is φ = 5668829520.

The previous prime is 21258110849. The next prime is 21258110851. The reversal of 21258110850 is 5801185212.

It is an interprime number because it is at equal distance from previous prime (21258110849) and next prime (21258110851).

It is not an unprimeable number, because it can be changed into a prime (21258110851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70860220 + ... + 70860519.

It is an arithmetic number, because the mean of its divisors is an integer number (2196671470).

Almost surely, 2^21258110850 is an apocalyptic number.

21258110850 is an abundant number, since it is smaller than the sum of its proper divisors (31462004430).

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

21258110850 is a wasteful number, since it uses less digits than its factorization.

21258110850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141720754 (or 141720749 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 33.

The spelling of 21258110850 in words is "twenty-one billion, two hundred fifty-eight million, one hundred ten thousand, eight hundred fifty".