2113650406621 has 4 divisors (see below), whose sum is σ = 2276238899452. Its totient is φ = 1951061913792.

The previous prime is 2113650406613. The next prime is 2113650406639. The reversal of 2113650406621 is 1266040563112.

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 145412568900 + 1968237837721 = 381330^2 + 1402939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113650406621 - 2³ = 2113650406613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113650403621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81294246396 + ... + 81294246421.

It is an arithmetic number, because the mean of its divisors is an integer number (569059724863).

Almost surely, 2^{2113650406621} is an apocalyptic number.

It is an amenable number.

2113650406621 is a deficient number, since it is larger than the sum of its proper divisors (162588492831).

2113650406621 is a wasteful number, since it uses less digits than its factorization.

2113650406621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162588492830.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 2113650406621 its reverse (1266040563112), we get a palindrome (3379690969733).

The spelling of 2113650406621 in words is "two trillion, one hundred thirteen billion, six hundred fifty million, four hundred six thousand, six hundred twenty-one".