1011101021220 has 48 divisors (see below), whose sum is σ = 2997617148288. Its totient is φ = 253766530560.

The previous prime is 1011101021167. The next prime is 1011101021239. The reversal of 1011101021220 is 221201011101.

It is a super-2 number, since 2×1011101021220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1011101021196 and 1011101021205.

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, 495636736 + ... + 495638775.

It is an arithmetic number, because the mean of its divisors is an integer number (62450357256).

Almost surely, 2^{1011101021220} is an apocalyptic number.

1011101021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011101021220 is an abundant number, since it is smaller than the sum of its proper divisors (1986516127068).

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

1011101021220 is a wasteful number, since it uses less digits than its factorization.

1011101021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991275540 (or 991275538 counting only the distinct ones).

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

Adding to 1011101021220 its reverse (221201011101), we get a palindrome (1232302032321).

The spelling of 1011101021220 in words is "one trillion, eleven billion, one hundred one million, twenty-one thousand, two hundred twenty".