1211021210 has 16 divisors (see below), whose sum is σ = 2491243776. Its totient is φ = 415207248.

The previous prime is 1211021173. The next prime is 1211021213. The reversal of 1211021210 is 121201121.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211021191 and 1211021200.

It is not an unprimeable number, because it can be changed into a prime (1211021213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8650082 + ... + 8650221.

It is an arithmetic number, because the mean of its divisors is an integer number (155702736).

Almost surely, 2^1211021210 is an apocalyptic number.

1211021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211021210 is an abundant number, since it is smaller than the sum of its proper divisors (1280222566).

1211021210 is a wasteful number, since it uses less digits than its factorization.

1211021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17300317.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1211021210 is about 34799.7300276884. The cubic root of 1211021210 is about 1065.9019330930.

Adding to 1211021210 its reverse (121201121), we get a palindrome (1332222331).

The spelling of 1211021210 in words is "one billion, two hundred eleven million, twenty-one thousand, two hundred ten".