1012321220 has 24 divisors (see below), whose sum is σ = 2126531904. Its totient is φ = 404803296.

The previous prime is 1012321207. The next prime is 1012321249. The reversal of 1012321220 is 221232101.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1012321195 and 1012321204.

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, 85799 + ... + 96881.

It is an arithmetic number, because the mean of its divisors is an integer number (88605496).

Almost surely, 2^1012321220 is an apocalyptic number.

1012321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012321220 is an abundant number, since it is smaller than the sum of its proper divisors (1114210684).

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

1012321220 is a wasteful number, since it uses less digits than its factorization.

1012321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15659 (or 15657 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1012321220 is about 31816.9957726998. The cubic root of 1012321220 is about 1004.0903198059.

Adding to 1012321220 its reverse (221232101), we get a palindrome (1233553321).

The spelling of 1012321220 in words is "one billion, twelve million, three hundred twenty-one thousand, two hundred twenty".