21553250319 has 24 divisors (see below), whose sum is σ = 31276627200. Its totient is φ = 14302403280.

The previous prime is 21553250317. The next prime is 21553250321. The reversal of 21553250319 is 91305235512.

21553250319 is a `hidden beast` number, since 2 + 15 + 5 + 325 + 0 + 319 = 666.

It is an interprime number because it is at equal distance from previous prime (21553250317) and next prime (21553250321).

It is not a de Polignac number, because 21553250319 - 2¹ = 21553250317 is a prime.

It is a super-2 number, since 2×21553250319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21553250317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3067192 + ... + 3074210.

It is an arithmetic number, because the mean of its divisors is an integer number (1303192800).

Almost surely, 2^21553250319 is an apocalyptic number.

21553250319 is a deficient number, since it is larger than the sum of its proper divisors (9723376881).

21553250319 is a wasteful number, since it uses less digits than its factorization.

21553250319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8555 (or 8552 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The spelling of 21553250319 in words is "twenty-one billion, five hundred fifty-three million, two hundred fifty thousand, three hundred nineteen".