1022001220 has 24 divisors (see below), whose sum is σ = 2160422208. Its totient is φ = 406092000.

The previous prime is 1022001187. The next prime is 1022001289. The reversal of 1022001220 is 221002201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1022001197 and 1022001206.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166186 + ... + 172225.

It is an arithmetic number, because the mean of its divisors is an integer number (90017592).

Almost surely, 2^1022001220 is an apocalyptic number.

1022001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1022001220 is an abundant number, since it is smaller than the sum of its proper divisors (1138420988).

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

1022001220 is a wasteful number, since it uses less digits than its factorization.

1022001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338571 (or 338569 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1022001220 is about 31968.7538074289. The cubic root of 1022001220 is about 1007.2806041616.

Adding to 1022001220 its reverse (221002201), we get a palindrome (1243003421).

The spelling of 1022001220 in words is "one billion, twenty-two million, one thousand, two hundred twenty".