1012221020 has 12 divisors (see below), whose sum is σ = 2125664184. Its totient is φ = 404888400.

The previous prime is 1012221013. The next prime is 1012221031. The reversal of 1012221020 is 201222101.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1012220992 and 1012221010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25305506 + ... + 25305545.

It is an arithmetic number, because the mean of its divisors is an integer number (177138682).

Almost surely, 2^1012221020 is an apocalyptic number.

1012221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012221020 is an abundant number, since it is smaller than the sum of its proper divisors (1113443164).

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

1012221020 is a wasteful number, since it uses less digits than its factorization.

1012221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50611060 (or 50611058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1012221020 is about 31815.4211036095. The cubic root of 1012221020 is about 1004.0571902789.

Adding to 1012221020 its reverse (201222101), we get a palindrome (1213443121).

The spelling of 1012221020 in words is "one billion, twelve million, two hundred twenty-one thousand, twenty".