12021653651642 has 8 divisors (see below), whose sum is σ = 18151900878432. Its totient is φ = 5971020025500.

The previous prime is 12021653651629. The next prime is 12021653651747. The reversal of 12021653651642 is 24615635612021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 12021653651593 and 12021653651602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19903399784 + ... + 19903400387.

It is an arithmetic number, because the mean of its divisors is an integer number (2268987609804).

Almost surely, 2^{12021653651642} is an apocalyptic number.

12021653651642 is a deficient number, since it is larger than the sum of its proper divisors (6130247226790).

12021653651642 is a wasteful number, since it uses less digits than its factorization.

12021653651642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39806800324.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 12021653651642 in words is "twelve trillion, twenty-one billion, six hundred fifty-three million, six hundred fifty-one thousand, six hundred forty-two".