12021161535 has 16 divisors (see below), whose sum is σ = 21370954080. Its totient is φ = 6411286080.

The previous prime is 12021161521. The next prime is 12021161543. The reversal of 12021161535 is 53516112021.

12021161535 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 11 + 615 + 35 = 666.

It is not a de Polignac number, because 12021161535 - 2⁸ = 12021161279 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 12021161499 and 12021161508.

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, 44522686 + ... + 44522955.

It is an arithmetic number, because the mean of its divisors is an integer number (1335684630).

Almost surely, 2^12021161535 is an apocalyptic number.

12021161535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12021161535 is a deficient number, since it is larger than the sum of its proper divisors (9349792545).

12021161535 is an equidigital number, since it uses as much as digits as its factorization.

12021161535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89045655 (or 89045649 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 12021161535 its reverse (53516112021), we get a palindrome (65537273556).

The spelling of 12021161535 in words is "twelve billion, twenty-one million, one hundred sixty-one thousand, five hundred thirty-five".