21121022020999 has 2 divisors, whose sum is σ = 21121022021000. Its totient is φ = 21121022020998.

The previous prime is 21121022020991. The next prime is 21121022021039. The reversal of 21121022020999 is 99902022012112.

It is an a-pointer prime, because the next prime (21121022021039) can be obtained adding 21121022020999 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121022020999 - 2³ = 21121022020991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121022020991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560511010499 + 10560511010500.

It is an arithmetic number, because the mean of its divisors is an integer number (10560511010500).

Almost surely, 2^{21121022020999} is an apocalyptic number.

21121022020999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121022020999 is an equidigital number, since it uses as much as digits as its factorization.

21121022020999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 21121022020999 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, twenty thousand, nine hundred ninety-nine".