20121201399 has 32 divisors (see below), whose sum is σ = 30007756800. Its totient is φ = 11907504000.

The previous prime is 20121201323. The next prime is 20121201407. The reversal of 20121201399 is 99310212102.

It is not a de Polignac number, because 20121201399 - 2⁸ = 20121201143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121201319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248442 + ... + 319320.

It is an arithmetic number, because the mean of its divisors is an integer number (937742400).

Almost surely, 2^20121201399 is an apocalyptic number.

20121201399 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20121201399 is a deficient number, since it is larger than the sum of its proper divisors (9886555401).

20121201399 is a wasteful number, since it uses less digits than its factorization.

20121201399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71175.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 20121201399 in words is "twenty billion, one hundred twenty-one million, two hundred one thousand, three hundred ninety-nine".