1212992121 has 16 divisors (see below), whose sum is σ = 1801893888. Its totient is φ = 719504400.

The previous prime is 1212992119. The next prime is 1212992171.

1212992121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1212992121 - 2¹ = 1212992119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212992171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389485 + ... + 392586.

It is an arithmetic number, because the mean of its divisors is an integer number (112618368).

Almost surely, 2^1212992121 is an apocalyptic number.

1212992121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212992121 is a deficient number, since it is larger than the sum of its proper divisors (588901767).

1212992121 is a wasteful number, since it uses less digits than its factorization.

1212992121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782132.

The product of its digits is 1296, while the sum is 30.

The square root of 1212992121 is about 34828.0364218254. The cubic root of 1212992121 is about 1066.4798638479.

The spelling of 1212992121 in words is "one billion, two hundred twelve million, nine hundred ninety-two thousand, one hundred twenty-one".