21155354150 has 24 divisors (see below), whose sum is σ = 44970239280. Its totient is φ = 7253264160.

The previous prime is 21155354137. The next prime is 21155354179. The reversal of 21155354150 is 5145355112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30221585 + ... + 30222284.

It is an arithmetic number, because the mean of its divisors is an integer number (1873759970).

Almost surely, 2^21155354150 is an apocalyptic number.

21155354150 is an abundant number, since it is smaller than the sum of its proper divisors (23814885130).

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

21155354150 is a wasteful number, since it uses less digits than its factorization.

21155354150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60443888 (or 60443883 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 21155354150 in words is "twenty-one billion, one hundred fifty-five million, three hundred fifty-four thousand, one hundred fifty".