2051560421 has 4 divisors (see below), whose sum is σ = 2055953952. Its totient is φ = 2047166892.

The previous prime is 2051560373. The next prime is 2051560453. The reversal of 2051560421 is 1240651502.

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 a de Polignac number, because none of the positive numbers 2^k-2051560421 is a prime.

It is a super-2 number, since 2×2051560421² = 8417800322027394482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051500421) 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, 2196065 + ... + 2196998.

It is an arithmetic number, because the mean of its divisors is an integer number (513988488).

Almost surely, 2^2051560421 is an apocalyptic number.

It is an amenable number.

2051560421 is a deficient number, since it is larger than the sum of its proper divisors (4393531).

2051560421 is an equidigital number, since it uses as much as digits as its factorization.

2051560421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393530.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2051560421 is about 45294.1543800080. The cubic root of 2051560421 is about 1270.6563290743.

The spelling of 2051560421 in words is "two billion, fifty-one million, five hundred sixty thousand, four hundred twenty-one".