20612231999 has 2 divisors, whose sum is σ = 20612232000. Its totient is φ = 20612231998.

The previous prime is 20612231957. The next prime is 20612232007. The reversal of 20612231999 is 99913221602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20612231999 - 2¹² = 20612227903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20612231929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306115999 + 10306116000.

It is an arithmetic number, because the mean of its divisors is an integer number (10306116000).

Almost surely, 2^20612231999 is an apocalyptic number.

20612231999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20612231999 is an equidigital number, since it uses as much as digits as its factorization.

20612231999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The spelling of 20612231999 in words is "twenty billion, six hundred twelve million, two hundred thirty-one thousand, nine hundred ninety-nine".