21890967299 has 2 divisors, whose sum is σ = 21890967300. Its totient is φ = 21890967298.

The previous prime is 21890967257. The next prime is 21890967313. The reversal of 21890967299 is 99276909812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21890967299 - 2¹⁶ = 21890901763 is a prime.

It is not a weakly prime, because it can be changed into another prime (21890967799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10945483649 + 10945483650.

It is an arithmetic number, because the mean of its divisors is an integer number (10945483650).

Almost surely, 2^21890967299 is an apocalyptic number.

21890967299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21890967299 is an equidigital number, since it uses as much as digits as its factorization.

21890967299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The spelling of 21890967299 in words is "twenty-one billion, eight hundred ninety million, nine hundred sixty-seven thousand, two hundred ninety-nine".