20121143239 has 2 divisors, whose sum is σ = 20121143240. Its totient is φ = 20121143238.

The previous prime is 20121143233. The next prime is 20121143243. The reversal of 20121143239 is 93234112102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121143239 - 2⁷ = 20121143111 is a prime.

It is a super-2 number, since 2×20121143239² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121143233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060571619 + 10060571620.

It is an arithmetic number, because the mean of its divisors is an integer number (10060571620).

Almost surely, 2^20121143239 is an apocalyptic number.

20121143239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121143239 is an equidigital number, since it uses as much as digits as its factorization.

20121143239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 20121143239 in words is "twenty billion, one hundred twenty-one million, one hundred forty-three thousand, two hundred thirty-nine".