12021653651640 has 32 divisors (see below), whose sum is σ = 36064960955280. Its totient is φ = 3205774307072.

The previous prime is 12021653651629. The next prime is 12021653651747. The reversal of 12021653651640 is 4615635612021.

It is a junction number, because it is equal to n+sod(n) for n = 12021653651592 and 12021653651601.

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, 50090223429 + ... + 50090223668.

Almost surely, 2^{12021653651640} is an apocalyptic number.

12021653651640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021653651640 is an abundant number, since it is smaller than the sum of its proper divisors (24043307303640).

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

12021653651640 is a wasteful number, since it uses less digits than its factorization.

12021653651640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100180447111 (or 100180447107 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 12021653651640 in words is "twelve trillion, twenty-one billion, six hundred fifty-three million, six hundred fifty-one thousand, six hundred forty".