20121121499 has 2 divisors, whose sum is σ = 20121121500. Its totient is φ = 20121121498.

The previous prime is 20121121483. The next prime is 20121121523. The reversal of 20121121499 is 99412112102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121121499 - 2⁴ = 20121121483 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121121459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060560749 + 10060560750.

It is an arithmetic number, because the mean of its divisors is an integer number (10060560750).

Almost surely, 2^20121121499 is an apocalyptic number.

20121121499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121121499 is an equidigital number, since it uses as much as digits as its factorization.

20121121499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 20121121499 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-one thousand, four hundred ninety-nine".