2651280421 has 2 divisors, whose sum is σ = 2651280422. Its totient is φ = 2651280420.

The previous prime is 2651280419. The next prime is 2651280433. The reversal of 2651280421 is 1240821562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2647617025 + 3663396 = 51455^2 + 1914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651280421 - 2¹ = 2651280419 is a prime.

Together with 2651280419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2651284421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325640210 + 1325640211.

It is an arithmetic number, because the mean of its divisors is an integer number (1325640211).

Almost surely, 2^2651280421 is an apocalyptic number.

It is an amenable number.

2651280421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2651280421 is an equidigital number, since it uses as much as digits as its factorization.

2651280421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 2651280421 is about 51490.5857511837. The cubic root of 2651280421 is about 1384.0503459708.

The spelling of 2651280421 in words is "two billion, six hundred fifty-one million, two hundred eighty thousand, four hundred twenty-one".