2801011721 has 2 divisors, whose sum is σ = 2801011722. Its totient is φ = 2801011720.

The previous prime is 2801011709. The next prime is 2801011729. The reversal of 2801011721 is 1271101082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2281399696 + 519612025 = 47764^2 + 22795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2801011721 - 2¹⁸ = 2800749577 is a prime.

It is a super-2 number, since 2×2801011721² = 15691333322358763682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2801011729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1400505860 + 1400505861.

It is an arithmetic number, because the mean of its divisors is an integer number (1400505861).

Almost surely, 2^2801011721 is an apocalyptic number.

It is an amenable number.

2801011721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2801011721 is an equidigital number, since it uses as much as digits as its factorization.

2801011721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 2801011721 is about 52924.5852227488. The cubic root of 2801011721 is about 1409.6294854974.

The spelling of 2801011721 in words is "two billion, eight hundred one million, eleven thousand, seven hundred twenty-one".