12021651342 has 16 divisors (see below), whose sum is σ = 26714780880. Its totient is φ = 4007217096.

The previous prime is 12021651331. The next prime is 12021651413. The reversal of 12021651342 is 24315612021.

12021651342 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 1 + 651 + 3 + 4 + 2 = 666.

It is a super-2 number, since 2×12021651342² (a number of 21 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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111311533 + ... + 111311640.

It is an arithmetic number, because the mean of its divisors is an integer number (1669673805).

Almost surely, 2^12021651342 is an apocalyptic number.

12021651342 is an abundant number, since it is smaller than the sum of its proper divisors (14693129538).

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

12021651342 is a wasteful number, since it uses less digits than its factorization.

12021651342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222623184 (or 222623178 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 12021651342 in words is "twelve billion, twenty-one million, six hundred fifty-one thousand, three hundred forty-two".