1000221420 has 48 divisors (see below), whose sum is σ = 3055223808. Its totient is φ = 242477760.

The previous prime is 1000221419. The next prime is 1000221437. The reversal of 1000221420 is 241220001.

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 = 1000221396 and 1000221405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 757084 + ... + 758403.

It is an arithmetic number, because the mean of its divisors is an integer number (63650496).

Almost surely, 2^1000221420 is an apocalyptic number.

1000221420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000221420 is an abundant number, since it is smaller than the sum of its proper divisors (2055002388).

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

1000221420 is a wasteful number, since it uses less digits than its factorization.

1000221420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515510 (or 1515508 counting only the distinct ones).

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

The square root of 1000221420 is about 31626.2773655073. The cubic root of 1000221420 is about 1000.0738012199.

Adding to 1000221420 its reverse (241220001), we get a palindrome (1241441421).

The spelling of 1000221420 in words is "one billion, two hundred twenty-one thousand, four hundred twenty".