1231022121 has 32 divisors (see below), whose sum is σ = 1939660800. Its totient is φ = 679587840.

The previous prime is 1231022119. The next prime is 1231022137. The reversal of 1231022121 is 1212201321.

It is not a de Polignac number, because 1231022121 - 2¹ = 1231022119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231022121.

It is not an unprimeable number, because it can be changed into a prime (1231062121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499390 + ... + 501848.

It is an arithmetic number, because the mean of its divisors is an integer number (60614400).

Almost surely, 2^1231022121 is an apocalyptic number.

It is an amenable number.

1231022121 is a deficient number, since it is larger than the sum of its proper divisors (708638679).

1231022121 is a wasteful number, since it uses less digits than its factorization.

1231022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1231022121 is about 35085.9248274860. The cubic root of 1231022121 is about 1071.7379741380.

Adding to 1231022121 its reverse (1212201321), we get a palindrome (2443223442).

The spelling of 1231022121 in words is "one billion, two hundred thirty-one million, twenty-two thousand, one hundred twenty-one".