1221101120210 has 16 divisors (see below), whose sum is σ = 2249097878016. Its totient is φ = 477081367728.

The previous prime is 1221101120189. The next prime is 1221101120233. The reversal of 1221101120210 is 120211011221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1419884594 + ... + 1419885453.

It is an arithmetic number, because the mean of its divisors is an integer number (140568617376).

Almost surely, 2^{1221101120210} is an apocalyptic number.

1221101120210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221101120210 is a deficient number, since it is larger than the sum of its proper divisors (1027996757806).

1221101120210 is a wasteful number, since it uses less digits than its factorization.

1221101120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839770097.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221101120210 its reverse (120211011221), we get a palindrome (1341312131431).

The spelling of 1221101120210 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty thousand, two hundred ten".