21342698401 has 2 divisors, whose sum is σ = 21342698402. Its totient is φ = 21342698400.

The previous prime is 21342698387. The next prime is 21342698431. The reversal of 21342698401 is 10489624312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20771727376 + 570971025 = 144124^2 + 23895^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342698401 - 2¹³ = 21342690209 is a prime.

It is not a weakly prime, because it can be changed into another prime (21342698431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671349200 + 10671349201.

It is an arithmetic number, because the mean of its divisors is an integer number (10671349201).

Almost surely, 2^21342698401 is an apocalyptic number.

It is an amenable number.

21342698401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342698401 is an equidigital number, since it uses as much as digits as its factorization.

21342698401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 21342698401 in words is "twenty-one billion, three hundred forty-two million, six hundred ninety-eight thousand, four hundred one".