20841649201 has 2 divisors, whose sum is σ = 20841649202. Its totient is φ = 20841649200.

The previous prime is 20841649193. The next prime is 20841649207. The reversal of 20841649201 is 10294614802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11869013025 + 8972636176 = 108945^2 + 94724^2 .

It is a cyclic number.

It is not a de Polignac number, because 20841649201 - 2³ = 20841649193 is a prime.

It is not a weakly prime, because it can be changed into another prime (20841649207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420824600 + 10420824601.

It is an arithmetic number, because the mean of its divisors is an integer number (10420824601).

Almost surely, 2^20841649201 is an apocalyptic number.

It is an amenable number.

20841649201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841649201 is an equidigital number, since it uses as much as digits as its factorization.

20841649201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 20841649201 in words is "twenty billion, eight hundred forty-one million, six hundred forty-nine thousand, two hundred one".