2122421652661 has 4 divisors (see below), whose sum is σ = 2122460401824. Its totient is φ = 2122382903500.

The previous prime is 2122421652643. The next prime is 2122421652671. The reversal of 2122421652661 is 1662561242212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2122421652661 - 2⁹ = 2122421652149 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 (2122421652671) 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, 19292305 + ... + 19402006.

It is an arithmetic number, because the mean of its divisors is an integer number (530615100456).

Almost surely, 2^{2122421652661} is an apocalyptic number.

It is an amenable number.

2122421652661 is a deficient number, since it is larger than the sum of its proper divisors (38749163).

2122421652661 is an equidigital number, since it uses as much as digits as its factorization.

2122421652661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38749162.

The product of its digits is 138240, while the sum is 40.

Adding to 2122421652661 its reverse (1662561242212), we get a palindrome (3784982894873).

The spelling of 2122421652661 in words is "two trillion, one hundred twenty-two billion, four hundred twenty-one million, six hundred fifty-two thousand, six hundred sixty-one".