2051300721 has 16 divisors (see below), whose sum is σ = 2840637440. Its totient is φ = 1315290960.

The previous prime is 2051300717. The next prime is 2051300729. The reversal of 2051300721 is 1270031502.

It is not a de Polignac number, because 2051300721 - 2² = 2051300717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051300729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52501 + ... + 82818.

It is an arithmetic number, because the mean of its divisors is an integer number (177539840).

Almost surely, 2^2051300721 is an apocalyptic number.

It is an amenable number.

2051300721 is a deficient number, since it is larger than the sum of its proper divisors (789336719).

2051300721 is a wasteful number, since it uses less digits than its factorization.

2051300721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135516.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 2051300721 is about 45291.2874734203. The cubic root of 2051300721 is about 1270.6027108023.

The spelling of 2051300721 in words is "two billion, fifty-one million, three hundred thousand, seven hundred twenty-one".