20211749087 has 2 divisors, whose sum is σ = 20211749088. Its totient is φ = 20211749086.

The previous prime is 20211749083. The next prime is 20211749141. The reversal of 20211749087 is 78094711202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211749087 - 2² = 20211749083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211749083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105874543 + 10105874544.

It is an arithmetic number, because the mean of its divisors is an integer number (10105874544).

Almost surely, 2^20211749087 is an apocalyptic number.

20211749087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211749087 is an equidigital number, since it uses as much as digits as its factorization.

20211749087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 41.

The spelling of 20211749087 in words is "twenty billion, two hundred eleven million, seven hundred forty-nine thousand, eighty-seven".