201521506432 has 16 divisors (see below), whose sum is σ = 401468626350. Its totient is φ = 100760753152.

The previous prime is 201521506399. The next prime is 201521506451. The reversal of 201521506432 is 234605125102.

It can be written as a sum of positive squares in only one way, i.e., 157914043456 + 43607462976 = 397384^2 + 208824^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×201521506432² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201521506394 and 201521506403.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 787193257 + ... + 787193512.

Almost surely, 2^201521506432 is an apocalyptic number.

It is an amenable number.

201521506432 is a deficient number, since it is larger than the sum of its proper divisors (199947119918).

201521506432 is an equidigital number, since it uses as much as digits as its factorization.

201521506432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574386783 (or 1574386771 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 201521506432 in words is "two hundred one billion, five hundred twenty-one million, five hundred six thousand, four hundred thirty-two".