2121645400601 has 8 divisors (see below), whose sum is σ = 2156707989384. Its totient is φ = 2086591893120.

The previous prime is 2121645400559. The next prime is 2121645400607. The reversal of 2121645400601 is 1060045461212.

It can be written as a sum of positive squares in 4 ways, for example, as 142415664400 + 1979229736201 = 377380^2 + 1406851^2 .

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 2121645400601 - 2²⁶ = 2121578291737 is a prime.

It is a super-2 number, since 2×2121645400601² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121645400607) 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, 1798406 + ... + 2734511.

It is an arithmetic number, because the mean of its divisors is an integer number (269588498673).

Almost surely, 2^{2121645400601} is an apocalyptic number.

It is an amenable number.

2121645400601 is a deficient number, since it is larger than the sum of its proper divisors (35062588783).

2121645400601 is an equidigital number, since it uses as much as digits as its factorization.

2121645400601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540651.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 2121645400601 in words is "two trillion, one hundred twenty-one billion, six hundred forty-five million, four hundred thousand, six hundred one".