21442026402451 has 2 divisors, whose sum is σ = 21442026402452. Its totient is φ = 21442026402450.

The previous prime is 21442026402403. The next prime is 21442026402491. The reversal of 21442026402451 is 15420462024412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21442026402451 - 2¹⁵ = 21442026369683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21442026402451.

It is not a weakly prime, because it can be changed into another prime (21442026402491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721013201225 + 10721013201226.

It is an arithmetic number, because the mean of its divisors is an integer number (10721013201226).

Almost surely, 2^{21442026402451} is an apocalyptic number.

21442026402451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442026402451 is an equidigital number, since it uses as much as digits as its factorization.

21442026402451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122880, while the sum is 37.

Adding to 21442026402451 its reverse (15420462024412), we get a palindrome (36862488426863).

The spelling of 21442026402451 in words is "twenty-one trillion, four hundred forty-two billion, twenty-six million, four hundred two thousand, four hundred fifty-one".