2051441621 has 2 divisors, whose sum is σ = 2051441622. Its totient is φ = 2051441620.

The previous prime is 2051441597. The next prime is 2051441633. The reversal of 2051441621 is 1261441502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2051093521 + 348100 = 45289^2 + 590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2051441621 is a prime.

It is a super-2 number, since 2×2051441621² = 8416825448742215282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051441641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025720810 + 1025720811.

It is an arithmetic number, because the mean of its divisors is an integer number (1025720811).

Almost surely, 2^2051441621 is an apocalyptic number.

It is an amenable number.

2051441621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051441621 is an equidigital number, since it uses as much as digits as its factorization.

2051441621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2051441621 is about 45292.8429335143. The cubic root of 2051441621 is about 1270.6318019088.

The spelling of 2051441621 in words is "two billion, fifty-one million, four hundred forty-one thousand, six hundred twenty-one".