20121223249 has 2 divisors, whose sum is σ = 20121223250. Its totient is φ = 20121223248.

The previous prime is 20121223247. The next prime is 20121223327. The reversal of 20121223249 is 94232212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18750372624 + 1370850625 = 136932^2 + 37025^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121223249 - 2¹ = 20121223247 is a prime.

Together with 20121223247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20121223247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060611624 + 10060611625.

It is an arithmetic number, because the mean of its divisors is an integer number (10060611625).

Almost surely, 2^20121223249 is an apocalyptic number.

It is an amenable number.

20121223249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121223249 is an equidigital number, since it uses as much as digits as its factorization.

20121223249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 20121223249 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-three thousand, two hundred forty-nine".