12021400204021 has 8 divisors (see below), whose sum is σ = 12961777629024. Its totient is φ = 11083259112240.

The previous prime is 12021400203997. The next prime is 12021400204027. The reversal of 12021400204021 is 12040200412021.

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

It is a cyclic number.

It is not a de Polignac number, because 12021400204021 - 2⁷ = 12021400203893 is a prime.

It is a super-2 number, since 2×12021400204021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021400204021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021400204027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559072135 + ... + 559093636.

It is an arithmetic number, because the mean of its divisors is an integer number (1620222203628).

Almost surely, 2^{12021400204021} is an apocalyptic number.

It is an amenable number.

12021400204021 is a deficient number, since it is larger than the sum of its proper divisors (940377425003).

12021400204021 is a wasteful number, since it uses less digits than its factorization.

12021400204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118166611.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 12021400204021 its reverse (12040200412021), we get a palindrome (24061600616042).

The spelling of 12021400204021 in words is "twelve trillion, twenty-one billion, four hundred million, two hundred four thousand, twenty-one".