1211211010 has 16 divisors (see below), whose sum is σ = 2210887872. Its totient is φ = 477660400.

The previous prime is 1211210977. The next prime is 1211211011. The reversal of 1211211010 is 101121121.

It is a super-3 number, since 3×1211211010³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 (1211211011) 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 7 ways as a sum of consecutive naturals, for example, 852256 + ... + 853675.

It is an arithmetic number, because the mean of its divisors is an integer number (138180492).

Almost surely, 2^1211211010 is an apocalyptic number.

1211211010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211211010 is a deficient number, since it is larger than the sum of its proper divisors (999676862).

1211211010 is a wasteful number, since it uses less digits than its factorization.

1211211010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706009.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1211211010 is about 34802.4569534968. The cubic root of 1211211010 is about 1065.9576154700.

Adding to 1211211010 its reverse (101121121), we get a palindrome (1312332131).

The spelling of 1211211010 in words is "one billion, two hundred eleven million, two hundred eleven thousand, ten".