1211210010 has 40 divisors (see below), whose sum is σ = 3256811316. Its totient is φ = 322989120.

The previous prime is 1211210009. The next prime is 1211210041. The reversal of 1211210010 is 100121121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1181365641 + 29844369 = 34371^2 + 5463^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1211209974 and 1211210001.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 746851 + ... + 748470.

Almost surely, 2^1211210010 is an apocalyptic number.

1211210010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211210010 is an abundant number, since it is smaller than the sum of its proper divisors (2045601306).

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

1211210010 is a wasteful number, since it uses less digits than its factorization.

1211210010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495340 (or 1495331 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1211210010 is about 34802.4425866921. The cubic root of 1211210010 is about 1065.9573221113.

Adding to 1211210010 its reverse (100121121), we get a palindrome (1311331131).

Subtracting from 1211210010 its reverse (100121121), we obtain a square (1111088889 = 33333²).

It can be divided in two parts, 12112 and 10010, that added together give a palindrome (22122).

The spelling of 1211210010 in words is "one billion, two hundred eleven million, two hundred ten thousand, ten".