221222001000 has 1536 divisors, whose sum is σ = 964274088960. Its totient is φ = 41057280000.

The previous prime is 221222000983. The next prime is 221222001017. The reversal of 221222001000 is 100222122.

It is an interprime number because it is at equal distance from previous prime (221222000983) and next prime (221222001017).

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

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 1222220910 + ... + 1222221090.

It is an arithmetic number, because the mean of its divisors is an integer number (627782610).

Almost surely, 2^221222001000 is an apocalyptic number.

221222001000 is a gapful number since it is divisible by the number (20) 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 221222001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (482137044480).

221222001000 is an abundant number, since it is smaller than the sum of its proper divisors (743052087960).

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

221222001000 is a wasteful number, since it uses less digits than its factorization.

221222001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 259 counting only the distinct ones).

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

Adding to 221222001000 its reverse (100222122), we get a palindrome (221322223122).

The spelling of 221222001000 in words is "two hundred twenty-one billion, two hundred twenty-two million, one thousand".