20999484241 has 2 divisors, whose sum is σ = 20999484242. Its totient is φ = 20999484240.

The previous prime is 20999484223. The next prime is 20999484281. The reversal of 20999484241 is 14248499902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18469897216 + 2529587025 = 135904^2 + 50295^2 .

It is a cyclic number.

It is not a de Polignac number, because 20999484241 - 2³¹ = 18852000593 is a prime.

It is not a weakly prime, because it can be changed into another prime (20999484211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10499742120 + 10499742121.

It is an arithmetic number, because the mean of its divisors is an integer number (10499742121).

Almost surely, 2^20999484241 is an apocalyptic number.

It is an amenable number.

20999484241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20999484241 is an equidigital number, since it uses as much as digits as its factorization.

20999484241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 20999484241 in words is "twenty billion, nine hundred ninety-nine million, four hundred eighty-four thousand, two hundred forty-one".