2126368653621 has 16 divisors (see below), whose sum is σ = 2959303887360. Its totient is φ = 1355542841840.

The previous prime is 2126368653613. The next prime is 2126368653641. The reversal of 2126368653621 is 1263568636212.

It is a cyclic number.

It is not a de Polignac number, because 2126368653621 - 2³ = 2126368653613 is a prime.

It is a super-2 number, since 2×2126368653621² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2126368653611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4338291 + ... + 4803488.

It is an arithmetic number, because the mean of its divisors is an integer number (184956492960).

Almost surely, 2^{2126368653621} is an apocalyptic number.

It is an amenable number.

2126368653621 is a deficient number, since it is larger than the sum of its proper divisors (832935233739).

2126368653621 is a wasteful number, since it uses less digits than its factorization.

2126368653621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9145176.

The product of its digits is 3732480, while the sum is 51.

The spelling of 2126368653621 in words is "two trillion, one hundred twenty-six billion, three hundred sixty-eight million, six hundred fifty-three thousand, six hundred twenty-one".