20210399941 has 2 divisors, whose sum is σ = 20210399942. Its totient is φ = 20210399940.

The previous prime is 20210399927. The next prime is 20210400019. The reversal of 20210399941 is 14999301202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18622696225 + 1587703716 = 136465^2 + 39846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210399941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210399894 and 20210399903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210399441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105199970 + 10105199971.

It is an arithmetic number, because the mean of its divisors is an integer number (10105199971).

Almost surely, 2^20210399941 is an apocalyptic number.

It is an amenable number.

20210399941 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210399941 is an equidigital number, since it uses as much as digits as its factorization.

20210399941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The spelling of 20210399941 in words is "twenty billion, two hundred ten million, three hundred ninety-nine thousand, nine hundred forty-one".