1221000231129 has 32 divisors (see below), whose sum is σ = 1865416734720. Its totient is φ = 695898604800.

The previous prime is 1221000231109. The next prime is 1221000231233. The reversal of 1221000231129 is 9211320001221.

It is not a de Polignac number, because 1221000231129 - 2²⁴ = 1220983453913 is a prime.

It is a super-2 number, since 2×1221000231129² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221000231099 and 1221000231108.

It is not an unprimeable number, because it can be changed into a prime (1221000231109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30688609 + ... + 30728369.

It is an arithmetic number, because the mean of its divisors is an integer number (58294272960).

Almost surely, 2^{1221000231129} is an apocalyptic number.

It is an amenable number.

1221000231129 is a deficient number, since it is larger than the sum of its proper divisors (644416503591).

1221000231129 is a wasteful number, since it uses less digits than its factorization.

1221000231129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43541.

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 1221000231129 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-one thousand, one hundred twenty-nine".