1011021221000 has 128 divisors (see below), whose sum is σ = 2734140614400. Its totient is φ = 342740851200.

The previous prime is 1011021220973. The next prime is 1011021221003. The reversal of 1011021221000 is 1221201101.

1011021221000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1011021221003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188414 + ... + 1434413.

It is an arithmetic number, because the mean of its divisors is an integer number (21360473550).

Almost surely, 2^{1011021221000} is an apocalyptic number.

1011021221000 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 1011021221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1367070307200).

1011021221000 is an abundant number, since it is smaller than the sum of its proper divisors (1723119393400).

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

1011021221000 is a wasteful number, since it uses less digits than its factorization.

1011021221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622944 (or 1622930 counting only the distinct ones).

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

Adding to 1011021221000 its reverse (1221201101), we get a palindrome (1012242422101).

The spelling of 1011021221000 in words is "one trillion, eleven billion, twenty-one million, two hundred twenty-one thousand".