1011001021220 has 96 divisors (see below), whose sum is σ = 2292903486720. Its totient is φ = 373300139520.

The previous prime is 1011001021153. The next prime is 1011001021231. The reversal of 1011001021220 is 221201001101.

1011001021220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 29611079 + ... + 29645201.

It is an arithmetic number, because the mean of its divisors is an integer number (23884411320).

Almost surely, 2^{1011001021220} is an apocalyptic number.

1011001021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011001021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146451743360).

1011001021220 is an abundant number, since it is smaller than the sum of its proper divisors (1281902465500).

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

1011001021220 is a wasteful number, since it uses less digits than its factorization.

1011001021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36405 (or 36403 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1011001021220 its reverse (221201001101), we get a palindrome (1232202022321).

The spelling of 1011001021220 in words is "one trillion, eleven billion, one million, twenty-one thousand, two hundred twenty".