2621111281 has 2 divisors, whose sum is σ = 2621111282. Its totient is φ = 2621111280.

The previous prime is 2621111267. The next prime is 2621111293. The reversal of 2621111281 is 1821111262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2457680625 + 163430656 = 49575^2 + 12784^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621111281 - 2²¹ = 2619014129 is a prime.

It is a super-2 number, since 2×2621111281² = 13740448694770921922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2621111261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310555640 + 1310555641.

It is an arithmetic number, because the mean of its divisors is an integer number (1310555641).

Almost surely, 2^2621111281 is an apocalyptic number.

It is an amenable number.

2621111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621111281 is an equidigital number, since it uses as much as digits as its factorization.

2621111281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 25.

The square root of 2621111281 is about 51196.7897528742. The cubic root of 2621111281 is about 1378.7805654533.

The spelling of 2621111281 in words is "two billion, six hundred twenty-one million, one hundred eleven thousand, two hundred eighty-one".