1211212210 has 16 divisors (see below), whose sum is σ = 2347888536. Its totient is φ = 447216768.

The previous prime is 1211212199. The next prime is 1211212213. The reversal of 1211212210 is 122121121.

1211212210 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 594335641 + 616876569 = 24379^2 + 24837^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (1211212213) 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, 4658379 + ... + 4658638.

Almost surely, 2^1211212210 is an apocalyptic number.

1211212210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211212210 is a deficient number, since it is larger than the sum of its proper divisors (1136676326).

1211212210 is a wasteful number, since it uses less digits than its factorization.

1211212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9317037.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1211212210 is about 34802.4741936547. The cubic root of 1211212210 is about 1065.9579675002.

Adding to 1211212210 its reverse (122121121), we get a palindrome (1333333331).

The spelling of 1211212210 in words is "one billion, two hundred eleven million, two hundred twelve thousand, two hundred ten".