21521554330 has 8 divisors (see below), whose sum is σ = 38738797812. Its totient is φ = 8608621728.

The previous prime is 21521554289. The next prime is 21521554333. The reversal of 21521554330 is 3345512512.

It can be written as a sum of positive squares in 2 ways, for example, as 17711084889 + 3810469441 = 133083^2 + 61729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21521554292 and 21521554301.

It is not an unprimeable number, because it can be changed into a prime (21521554333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076077707 + ... + 1076077726.

Almost surely, 2^21521554330 is an apocalyptic number.

21521554330 is a deficient number, since it is larger than the sum of its proper divisors (17217243482).

21521554330 is a wasteful number, since it uses less digits than its factorization.

21521554330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152155440.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21521554330 in words is "twenty-one billion, five hundred twenty-one million, five hundred fifty-four thousand, three hundred thirty".