1212920524129 has 4 divisors (see below), whose sum is σ = 1212925223620. Its totient is φ = 1212915824640.

The previous prime is 1212920524121. The next prime is 1212920524163. The reversal of 1212920524129 is 9214250292121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 523123832529 + 689796691600 = 723273^2 + 830540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212920524129 - 2³ = 1212920524121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212920524091 and 1212920524100.

It is not an unprimeable number, because it can be changed into a prime (1212920524121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1938624 + ... + 2486785.

It is an arithmetic number, because the mean of its divisors is an integer number (303231305905).

Almost surely, 2^{1212920524129} is an apocalyptic number.

It is an amenable number.

1212920524129 is a deficient number, since it is larger than the sum of its proper divisors (4699491).

1212920524129 is an equidigital number, since it uses as much as digits as its factorization.

1212920524129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4699490.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 1212920524129 in words is "one trillion, two hundred twelve billion, nine hundred twenty million, five hundred twenty-four thousand, one hundred twenty-nine".