1211230100 has 36 divisors (see below), whose sum is σ = 2635768800. Its totient is φ = 483128160.

The previous prime is 1211230079. The next prime is 1211230121. The reversal of 1211230100 is 10321121.

It is an interprime number because it is at equal distance from previous prime (1211230079) and next prime (1211230121).

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, 19031 + ... + 52769.

It is an arithmetic number, because the mean of its divisors is an integer number (73215800).

Almost surely, 2^1211230100 is an apocalyptic number.

1211230100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211230100 is an abundant number, since it is smaller than the sum of its proper divisors (1424538700).

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

1211230100 is a wasteful number, since it uses less digits than its factorization.

1211230100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34112 (or 34105 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1211230100 is about 34802.7312146619. The cubic root of 1211230100 is about 1065.9632156569.

Adding to 1211230100 its reverse (10321121), we get a palindrome (1221551221).

The spelling of 1211230100 in words is "one billion, two hundred eleven million, two hundred thirty thousand, one hundred".