21999196801 has 2 divisors, whose sum is σ = 21999196802. Its totient is φ = 21999196800.

The previous prime is 21999196787. The next prime is 21999196811. The reversal of 21999196801 is 10869199912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14544601201 + 7454595600 = 120601^2 + 86340^2 .

It is a cyclic number.

It is not a de Polignac number, because 21999196801 - 2¹¹ = 21999194753 is a prime.

It is not a weakly prime, because it can be changed into another prime (21999196811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10999598400 + 10999598401.

It is an arithmetic number, because the mean of its divisors is an integer number (10999598401).

Almost surely, 2^21999196801 is an apocalyptic number.

It is an amenable number.

21999196801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21999196801 is an equidigital number, since it uses as much as digits as its factorization.

21999196801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 55.

The spelling of 21999196801 in words is "twenty-one billion, nine hundred ninety-nine million, one hundred ninety-six thousand, eight hundred one".