20002299521 has 2 divisors, whose sum is σ = 20002299522. Its totient is φ = 20002299520.

The previous prime is 20002299517. The next prime is 20002299523. The reversal of 20002299521 is 12599220002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14870583025 + 5131716496 = 121945^2 + 71636^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002299521 - 2² = 20002299517 is a prime.

It is a super-2 number, since 2×20002299521² (a number of 21 digits) contains 22 as substring.

Together with 20002299523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20002299523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001149760 + 10001149761.

It is an arithmetic number, because the mean of its divisors is an integer number (10001149761).

Almost surely, 2^20002299521 is an apocalyptic number.

It is an amenable number.

20002299521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002299521 is an equidigital number, since it uses as much as digits as its factorization.

20002299521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 20002299521 in words is "twenty billion, two million, two hundred ninety-nine thousand, five hundred twenty-one".