21196532801 has 2 divisors, whose sum is σ = 21196532802. Its totient is φ = 21196532800.

The previous prime is 21196532737. The next prime is 21196532821. The reversal of 21196532801 is 10823569112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12465499201 + 8731033600 = 111649^2 + 93440^2 .

It is a cyclic number.

It is not a de Polignac number, because 21196532801 - 2⁶ = 21196532737 is a prime.

It is not a weakly prime, because it can be changed into another prime (21196532821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10598266400 + 10598266401.

It is an arithmetic number, because the mean of its divisors is an integer number (10598266401).

Almost surely, 2^21196532801 is an apocalyptic number.

It is an amenable number.

21196532801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21196532801 is an equidigital number, since it uses as much as digits as its factorization.

21196532801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 21196532801 in words is "twenty-one billion, one hundred ninety-six million, five hundred thirty-two thousand, eight hundred one".