1011211101220 has 96 divisors (see below), whose sum is σ = 2171154222720. Its totient is φ = 395471831040.

The previous prime is 1011211101217. The next prime is 1011211101239. The reversal of 1011211101220 is 221011121101.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011211101220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 464070091 + ... + 464072269.

It is an arithmetic number, because the mean of its divisors is an integer number (22616189820).

Almost surely, 2^{1011211101220} is an apocalyptic number.

1011211101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011211101220 is an abundant number, since it is smaller than the sum of its proper divisors (1159943121500).

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

1011211101220 is a wasteful number, since it uses less digits than its factorization.

1011211101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565 (or 3563 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1011211101220 its reverse (221011121101), we get a palindrome (1232222222321).

The spelling of 1011211101220 in words is "one trillion, eleven billion, two hundred eleven million, one hundred one thousand, two hundred twenty".