21082698451 has 2 divisors, whose sum is σ = 21082698452. Its totient is φ = 21082698450.

The previous prime is 21082698431. The next prime is 21082698473. The reversal of 21082698451 is 15489628012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21082698451 - 2¹³ = 21082690259 is a prime.

It is not a weakly prime, because it can be changed into another prime (21082698431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541349225 + 10541349226.

It is an arithmetic number, because the mean of its divisors is an integer number (10541349226).

Almost surely, 2^21082698451 is an apocalyptic number.

21082698451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21082698451 is an equidigital number, since it uses as much as digits as its factorization.

21082698451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 21082698451 in words is "twenty-one billion, eighty-two million, six hundred ninety-eight thousand, four hundred fifty-one".