2061936521 has 4 divisors (see below), whose sum is σ = 2071708944. Its totient is φ = 2052164100.

The previous prime is 2061936517. The next prime is 2061936523. The reversal of 2061936521 is 1256391602.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1256391602 = 2 ⋅628195801.

It is a cyclic number.

It is not a de Polignac number, because 2061936521 - 2² = 2061936517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2061936523) 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, 4885895 + ... + 4886316.

It is an arithmetic number, because the mean of its divisors is an integer number (517927236).

Almost surely, 2^2061936521 is an apocalyptic number.

It is an amenable number.

2061936521 is a deficient number, since it is larger than the sum of its proper divisors (9772423).

2061936521 is an equidigital number, since it uses as much as digits as its factorization.

2061936521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9772422.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 2061936521 is about 45408.5511880747. The cubic root of 2061936521 is about 1272.7949112864.

The spelling of 2061936521 in words is "two billion, sixty-one million, nine hundred thirty-six thousand, five hundred twenty-one".