2126361028621 has 4 divisors (see below), whose sum is σ = 2126519761212. Its totient is φ = 2126202296032.

The previous prime is 2126361028609. The next prime is 2126361028681. The reversal of 2126361028621 is 1268201636212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 543950500900 + 1582410527721 = 737530^2 + 1257939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126361028621 - 2²¹ = 2126358931469 is a prime.

It is a super-2 number, since 2×2126361028621² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2126361028601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79346200 + ... + 79372993.

It is an arithmetic number, because the mean of its divisors is an integer number (531629940303).

Almost surely, 2^{2126361028621} is an apocalyptic number.

It is an amenable number.

2126361028621 is a deficient number, since it is larger than the sum of its proper divisors (158732591).

2126361028621 is a wasteful number, since it uses less digits than its factorization.

2126361028621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158732590.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 2126361028621 in words is "two trillion, one hundred twenty-six billion, three hundred sixty-one million, twenty-eight thousand, six hundred twenty-one".