1213102121 has 32 divisors (see below), whose sum is σ = 1541265408. Its totient is φ = 927440640.

The previous prime is 1213102097. The next prime is 1213102157. The reversal of 1213102121 is 1212013121.

It is not a de Polignac number, because 1213102121 - 2⁶ = 1213102057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213102096 and 1213102105.

It is not an unprimeable number, because it can be changed into a prime (1213102321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 930356 + ... + 931658.

It is an arithmetic number, because the mean of its divisors is an integer number (48164544).

Almost surely, 2^1213102121 is an apocalyptic number.

1213102121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213102121 is a deficient number, since it is larger than the sum of its proper divisors (328163287).

1213102121 is a wasteful number, since it uses less digits than its factorization.

1213102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1213102121 is about 34829.6155735317. The cubic root of 1213102121 is about 1066.5121007264.

Adding to 1213102121 its reverse (1212013121), we get a palindrome (2425115242).

The spelling of 1213102121 in words is "one billion, two hundred thirteen million, one hundred two thousand, one hundred twenty-one".