20120021221999 has 2 divisors, whose sum is σ = 20120021222000. Its totient is φ = 20120021221998.

The previous prime is 20120021221943. The next prime is 20120021222009. The reversal of 20120021221999 is 99912212002102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120021221999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120021221939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060010610999 + 10060010611000.

It is an arithmetic number, because the mean of its divisors is an integer number (10060010611000).

Almost surely, 2^{20120021221999} is an apocalyptic number.

20120021221999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120021221999 is an equidigital number, since it uses as much as digits as its factorization.

20120021221999 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 20120021221999 in words is "twenty trillion, one hundred twenty billion, twenty-one million, two hundred twenty-one thousand, nine hundred ninety-nine".