20121023249 has 2 divisors, whose sum is σ = 20121023250. Its totient is φ = 20121023248.

The previous prime is 20121023233. The next prime is 20121023269. The reversal of 20121023249 is 94232012102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19974734224 + 146289025 = 141332^2 + 12095^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121023249 - 2⁴ = 20121023233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121023269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060511624 + 10060511625.

It is an arithmetic number, because the mean of its divisors is an integer number (10060511625).

Almost surely, 2^20121023249 is an apocalyptic number.

It is an amenable number.

20121023249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121023249 is an equidigital number, since it uses as much as digits as its factorization.

20121023249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 20121023249 in words is "twenty billion, one hundred twenty-one million, twenty-three thousand, two hundred forty-nine".