1211122222210 has 8 divisors (see below), whose sum is σ = 2180019999996. Its totient is φ = 484448888880.

The previous prime is 1211122222201. The next prime is 1211122222301. The reversal of 1211122222210 is 122222211121.

It can be written as a sum of positive squares in 2 ways, for example, as 1153688661801 + 57433560409 = 1074099^2 + 239653^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60556111101 + ... + 60556111120.

Almost surely, 2^{1211122222210} is an apocalyptic number.

1211122222210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211122222210 is a deficient number, since it is larger than the sum of its proper divisors (968897777786).

1211122222210 is a wasteful number, since it uses less digits than its factorization.

1211122222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121112222228.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1211122222210 its reverse (122222211121), we get a palindrome (1333344433331).

The spelling of 1211122222210 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred ten".