1221101210210 has 16 divisors (see below), whose sum is σ = 2511979632576. Its totient is φ = 418663272048.

The previous prime is 1221101210191. The next prime is 1221101210239. The reversal of 1221101210210 is 120121011221.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 8722151432 + ... + 8722151571.

It is an arithmetic number, because the mean of its divisors is an integer number (156998727036).

Almost surely, 2^{1221101210210} is an apocalyptic number.

1221101210210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221101210210 is an abundant number, since it is smaller than the sum of its proper divisors (1290878422366).

1221101210210 is a wasteful number, since it uses less digits than its factorization.

1221101210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17444303017.

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

Adding to 1221101210210 its reverse (120121011221), we get a palindrome (1341222221431).

The spelling of 1221101210210 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred ten thousand, two hundred ten".