11807587021 has 4 divisors (see below), whose sum is σ = 12082182112. Its totient is φ = 11532991932.

The previous prime is 11807587003. The next prime is 11807587037. The reversal of 11807587021 is 12078570811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12078570811 = 33589 ⋅359599.

It is a cyclic number.

It is not a de Polignac number, because 11807587021 - 2¹³ = 11807578829 is a prime.

It is a super-2 number, since 2×11807587021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11807587921) 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, 137297481 + ... + 137297566.

It is an arithmetic number, because the mean of its divisors is an integer number (3020545528).

Almost surely, 2^11807587021 is an apocalyptic number.

It is an amenable number.

11807587021 is a deficient number, since it is larger than the sum of its proper divisors (274595091).

11807587021 is an equidigital number, since it uses as much as digits as its factorization.

11807587021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274595090.

The product of its (nonzero) digits is 31360, while the sum is 40.

The spelling of 11807587021 in words is "eleven billion, eight hundred seven million, five hundred eighty-seven thousand, twenty-one".