1211100221010 has 32 divisors (see below), whose sum is σ = 2955905628480. Its totient is φ = 317486159168.

The previous prime is 1211100220991. The next prime is 1211100221029. The reversal of 1211100221010 is 101220011121.

It is an interprime number because it is at equal distance from previous prime (1211100220991) and next prime (1211100221029).

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, 342116937 + ... + 342120476.

It is an arithmetic number, because the mean of its divisors is an integer number (92372050890).

Almost surely, 2^{1211100221010} is an apocalyptic number.

1211100221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211100221010 is an abundant number, since it is smaller than the sum of its proper divisors (1744805407470).

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

1211100221010 is a wasteful number, since it uses less digits than its factorization.

1211100221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684237482.

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

Adding to 1211100221010 its reverse (101220011121), we get a palindrome (1312320232131).

The spelling of 1211100221010 in words is "one trillion, two hundred eleven billion, one hundred million, two hundred twenty-one thousand, ten".