20219758991 has 2 divisors, whose sum is σ = 20219758992. Its totient is φ = 20219758990.

The previous prime is 20219758957. The next prime is 20219759003. The reversal of 20219758991 is 19985791202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20219758991 - 2¹⁴ = 20219742607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20219752991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109879495 + 10109879496.

It is an arithmetic number, because the mean of its divisors is an integer number (10109879496).

Almost surely, 2^20219758991 is an apocalyptic number.

20219758991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20219758991 is an equidigital number, since it uses as much as digits as its factorization.

20219758991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 20219758991 in words is "twenty billion, two hundred nineteen million, seven hundred fifty-eight thousand, nine hundred ninety-one".