1231221102 has 24 divisors (see below), whose sum is σ = 2530810296. Its totient is φ = 399312288.

The previous prime is 1231221091. The next prime is 1231221113. The reversal of 1231221102 is 2011221321.

It is an interprime number because it is at equal distance from previous prime (1231221091) and next prime (1231221113).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66733 + ... + 83160.

It is an arithmetic number, because the mean of its divisors is an integer number (105450429).

Almost surely, 2^1231221102 is an apocalyptic number.

1231221102 is an abundant number, since it is smaller than the sum of its proper divisors (1299589194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231221102 is a wasteful number, since it uses less digits than its factorization.

1231221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149972 (or 149935 counting only the distinct ones).

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

The square root of 1231221102 is about 35088.7603371792. The cubic root of 1231221102 is about 1071.7957158582.

Adding to 1231221102 its reverse (2011221321), we get a palindrome (3242442423).

The spelling of 1231221102 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, one hundred two".