221000011020 has 72 divisors (see below), whose sum is σ = 685956647376. Its totient is φ = 57562791552.

The previous prime is 221000010991. The next prime is 221000011049. The reversal of 221000011020 is 20110000122.

It is an interprime number because it is at equal distance from previous prime (221000010991) and next prime (221000011049).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 221000010993 and 221000011011.

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, 14268747 + ... + 14284226.

It is an arithmetic number, because the mean of its divisors is an integer number (9527175658).

Almost surely, 2^221000011020 is an apocalyptic number.

221000011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221000011020 is an abundant number, since it is smaller than the sum of its proper divisors (464956636356).

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

221000011020 is a wasteful number, since it uses less digits than its factorization.

221000011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28553031 (or 28553026 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 221000011020 its reverse (20110000122), we get a palindrome (241110011142).

The spelling of 221000011020 in words is "two hundred twenty-one billion, eleven thousand, twenty".