2153321200661 has 4 divisors (see below), whose sum is σ = 2153756836032. Its totient is φ = 2152885565292.

The previous prime is 2153321200621. The next prime is 2153321200673. The reversal of 2153321200661 is 1660021233512.

It is a happy number.

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 2153321200661 - 2²⁶ = 2153254091797 is a prime.

It is a super-2 number, since 2×2153321200661² (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 (2153321200601) 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, 217810271 + ... + 217820156.

It is an arithmetic number, because the mean of its divisors is an integer number (538439209008).

Almost surely, 2^{2153321200661} is an apocalyptic number.

It is an amenable number.

2153321200661 is a deficient number, since it is larger than the sum of its proper divisors (435635371).

2153321200661 is an equidigital number, since it uses as much as digits as its factorization.

2153321200661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435635370.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 2153321200661 in words is "two trillion, one hundred fifty-three billion, three hundred twenty-one million, two hundred thousand, six hundred sixty-one".