1221011100210 has 32 divisors (see below), whose sum is σ = 3196829063232. Its totient is φ = 296002690880.

The previous prime is 1221011100139. The next prime is 1221011100227. The reversal of 1221011100210 is 120011101221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1850016489 + ... + 1850017148.

It is an arithmetic number, because the mean of its divisors is an integer number (99900908226).

Almost surely, 2^{1221011100210} is an apocalyptic number.

1221011100210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221011100210 is an abundant number, since it is smaller than the sum of its proper divisors (1975817963022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221011100210 is a wasteful number, since it uses less digits than its factorization.

1221011100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700033658.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221011100210 its reverse (120011101221), we get a palindrome (1341022201431).

The spelling of 1221011100210 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred thousand, two hundred ten".