2136219661 has 4 divisors (see below), whose sum is σ = 2185899232. Its totient is φ = 2086540092.

The previous prime is 2136219649. The next prime is 2136219697. The reversal of 2136219661 is 1669126312.

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 2136219661 - 2¹¹ = 2136217613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2136219661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2136219611) 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, 24839721 + ... + 24839806.

It is an arithmetic number, because the mean of its divisors is an integer number (546474808).

Almost surely, 2^2136219661 is an apocalyptic number.

It is an amenable number.

2136219661 is a deficient number, since it is larger than the sum of its proper divisors (49679571).

2136219661 is an equidigital number, since it uses as much as digits as its factorization.

2136219661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49679570.

The product of its digits is 23328, while the sum is 37.

The square root of 2136219661 is about 46219.2563873544. The cubic root of 2136219661 is about 1287.8994842425.

The spelling of 2136219661 in words is "two billion, one hundred thirty-six million, two hundred nineteen thousand, six hundred sixty-one".