1201213100 has 18 divisors (see below), whose sum is σ = 2606632644. Its totient is φ = 480485200.

The previous prime is 1201213061. The next prime is 1201213109. The reversal of 1201213100 is 13121021.

It is a super-2 number, since 2×1201213100² = 2885825823223220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1201213109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6005966 + ... + 6006165.

Almost surely, 2^1201213100 is an apocalyptic number.

1201213100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201213100 is an abundant number, since it is smaller than the sum of its proper divisors (1405419544).

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

1201213100 is a wasteful number, since it uses less digits than its factorization.

1201213100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12012145 (or 12012138 counting only the distinct ones).

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

The square root of 1201213100 is about 34658.5213187176. The cubic root of 1201213100 is about 1063.0165350047.

Adding to 1201213100 its reverse (13121021), we get a palindrome (1214334121).

The spelling of 1201213100 in words is "one billion, two hundred one million, two hundred thirteen thousand, one hundred".