21150090072 has 48 divisors (see below), whose sum is σ = 58829649840. Its totient is φ = 6859487808.

The previous prime is 21150090023. The next prime is 21150090083. The reversal of 21150090072 is 27009005112.

21150090072 is a `hidden beast` number, since 2 + 1 + 1 + 500 + 90 + 0 + 72 = 666.

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, 3966948 + ... + 3972275.

It is an arithmetic number, because the mean of its divisors is an integer number (1225617705).

Almost surely, 2^21150090072 is an apocalyptic number.

It is an amenable number.

21150090072 is an abundant number, since it is smaller than the sum of its proper divisors (37679559768).

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

21150090072 is a wasteful number, since it uses less digits than its factorization.

21150090072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7939272 (or 7939265 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

Adding to 21150090072 its reverse (27009005112), we get a palindrome (48159095184).

The spelling of 21150090072 in words is "twenty-one billion, one hundred fifty million, ninety thousand, seventy-two".