1210212100 has 36 divisors (see below), whose sum is σ = 2710882048. Its totient is φ = 468468000.

The previous prime is 1210212077. The next prime is 1210212109. The reversal of 1210212100 is 12120121.

It is a super-2 number, since 2×1210212100² = 2929226653972820000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (1210212109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192096 + ... + 198295.

Almost surely, 2^1210212100 is an apocalyptic number.

1210212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210212100 is an abundant number, since it is smaller than the sum of its proper divisors (1500669948).

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

1210212100 is a wasteful number, since it uses less digits than its factorization.

1210212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390436 (or 390429 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1210212100 is about 34788.1028514060. The cubic root of 1210212100 is about 1065.6644960035.

Adding to 1210212100 its reverse (12120121), we get a palindrome (1222332221).

The spelling of 1210212100 in words is "one billion, two hundred ten million, two hundred twelve thousand, one hundred".