21541436250 has 80 divisors (see below), whose sum is σ = 53892448896. Its totient is φ = 5738400000.

The previous prime is 21541436233. The next prime is 21541436317. The reversal of 21541436250 is 5263414512.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4501359 + ... + 4506141.

Almost surely, 2^21541436250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21541436250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26946224448).

21541436250 is an abundant number, since it is smaller than the sum of its proper divisors (32351012646).

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

21541436250 is a wasteful number, since it uses less digits than its factorization.

21541436250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6009 (or 5994 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21541436250 in words is "twenty-one billion, five hundred forty-one million, four hundred thirty-six thousand, two hundred fifty".