21380448601 has 2 divisors, whose sum is σ = 21380448602. Its totient is φ = 21380448600.

The previous prime is 21380448569. The next prime is 21380448619. The reversal of 21380448601 is 10684408312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12210471001 + 9169977600 = 110501^2 + 95760^2 .

It is a cyclic number.

It is not a de Polignac number, because 21380448601 - 2⁵ = 21380448569 is a prime.

It is not a weakly prime, because it can be changed into another prime (21380448641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10690224300 + 10690224301.

It is an arithmetic number, because the mean of its divisors is an integer number (10690224301).

Almost surely, 2^21380448601 is an apocalyptic number.

It is an amenable number.

21380448601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21380448601 is an equidigital number, since it uses as much as digits as its factorization.

21380448601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 21380448601 in words is "twenty-one billion, three hundred eighty million, four hundred forty-eight thousand, six hundred one".