20861333371 has 2 divisors, whose sum is σ = 20861333372. Its totient is φ = 20861333370.

The previous prime is 20861333357. The next prime is 20861333413. The reversal of 20861333371 is 17333316802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20861333371 - 2¹³ = 20861325179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20861333371.

It is not a weakly prime, because it can be changed into another prime (20861333971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10430666685 + 10430666686.

It is an arithmetic number, because the mean of its divisors is an integer number (10430666686).

Almost surely, 2^20861333371 is an apocalyptic number.

20861333371 is a deficient number, since it is larger than the sum of its proper divisors (1).

20861333371 is an equidigital number, since it uses as much as digits as its factorization.

20861333371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 37.

The spelling of 20861333371 in words is "twenty billion, eight hundred sixty-one million, three hundred thirty-three thousand, three hundred seventy-one".