1011012211220 has 72 divisors (see below), whose sum is σ = 2390602904424. Its totient is φ = 358673920000.

The previous prime is 1011012211219. The next prime is 1011012211267. The reversal of 1011012211220 is 221122101101.

It can be written as a sum of positive squares in 4 ways, for example, as 271524484 + 1010740686736 = 16478^2 + 1005356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1011012211195 and 1011012211204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4995581 + ... + 5194020.

It is an arithmetic number, because the mean of its divisors is an integer number (33202818117).

Almost surely, 2^{1011012211220} is an apocalyptic number.

1011012211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011012211220 is an abundant number, since it is smaller than the sum of its proper divisors (1379590693204).

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

1011012211220 is a wasteful number, since it uses less digits than its factorization.

1011012211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10189673 (or 10189660 counting only the distinct ones).

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

Adding to 1011012211220 its reverse (221122101101), we get a palindrome (1232134312321).

The spelling of 1011012211220 in words is "one trillion, eleven billion, twelve million, two hundred eleven thousand, two hundred twenty".