201091521240 has 64 divisors (see below), whose sum is σ = 670305074400. Its totient is φ = 53624405376.

The previous prime is 201091521193. The next prime is 201091521287. The reversal of 201091521240 is 42125190102.

201091521240 is a `hidden beast` number, since 2 + 0 + 10 + 91 + 521 + 2 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (201091521193) and next prime (201091521287).

It is a super-2 number, since 2×201091521240² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93096847 + ... + 93099006.

Almost surely, 2^201091521240 is an apocalyptic number.

201091521240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201091521240 is an abundant number, since it is smaller than the sum of its proper divisors (469213553160).

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

201091521240 is a wasteful number, since it uses less digits than its factorization.

201091521240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186195873 (or 186195863 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 201091521240 in words is "two hundred one billion, ninety-one million, five hundred twenty-one thousand, two hundred forty".