201621611249 has 4 divisors (see below), whose sum is σ = 201628788900. Its totient is φ = 201614433600.

The previous prime is 201621611221. The next prime is 201621611251. The reversal of 201621611249 is 942116126102.

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 71323714225 + 130297897024 = 267065^2 + 360968^2 .

It is a cyclic number.

It is not a de Polignac number, because 201621611249 - 2¹² = 201621607153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201621611449) 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, 3546524 + ... + 3602925.

It is an arithmetic number, because the mean of its divisors is an integer number (50407197225).

Almost surely, 2^201621611249 is an apocalyptic number.

It is an amenable number.

201621611249 is a deficient number, since it is larger than the sum of its proper divisors (7177651).

201621611249 is an equidigital number, since it uses as much as digits as its factorization.

201621611249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7177650.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 201621611249 in words is "two hundred one billion, six hundred twenty-one million, six hundred eleven thousand, two hundred forty-nine".