21215409150 has 96 divisors (see below), whose sum is σ = 56777616000. Its totient is φ = 5211550080.

The previous prime is 21215409143. The next prime is 21215409197. The reversal of 21215409150 is 5190451212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 962149 + ... + 983951.

It is an arithmetic number, because the mean of its divisors is an integer number (591433500).

Almost surely, 2^21215409150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21215409150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28388808000).

21215409150 is an abundant number, since it is smaller than the sum of its proper divisors (35562206850).

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

21215409150 is a wasteful number, since it uses less digits than its factorization.

21215409150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22330 (or 22325 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 21215409150 in words is "twenty-one billion, two hundred fifteen million, four hundred nine thousand, one hundred fifty".