1000021220220 has 96 divisors (see below), whose sum is σ = 3234293266176. Its totient is φ = 228168832000.

The previous prime is 1000021220189. The next prime is 1000021220227. The reversal of 1000021220220 is 220221200001.

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 = 1000021220196 and 1000021220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021220227) 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, 44553006 + ... + 44575445.

It is an arithmetic number, because the mean of its divisors is an integer number (33690554856).

Almost surely, 2^{1000021220220} is an apocalyptic number.

1000021220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000021220220 is an abundant number, since it is smaller than the sum of its proper divisors (2234272045956).

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

1000021220220 is a wasteful number, since it uses less digits than its factorization.

1000021220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89128491 (or 89128489 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 1000021220220 its reverse (220221200001), we get a palindrome (1220242420221).

The spelling of 1000021220220 in words is "one trillion, twenty-one million, two hundred twenty thousand, two hundred twenty".