1012221021 has 32 divisors (see below), whose sum is σ = 1685864448. Its totient is φ = 526821120.

The previous prime is 1012221013. The next prime is 1012221031. The reversal of 1012221021 is 1201222101.

1012221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1012221021 - 2³ = 1012221013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012220988 and 1012221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012221031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34665 + ... + 56798.

It is an arithmetic number, because the mean of its divisors is an integer number (52683264).

Almost surely, 2^1012221021 is an apocalyptic number.

It is an amenable number.

1012221021 is a deficient number, since it is larger than the sum of its proper divisors (673643427).

1012221021 is a wasteful number, since it uses less digits than its factorization.

1012221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91521.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1012221021 is about 31815.4211193251. The cubic root of 1012221021 is about 1004.0571906095.

Adding to 1012221021 its reverse (1201222101), we get a palindrome (2213443122).

The spelling of 1012221021 in words is "one billion, twelve million, two hundred twenty-one thousand, twenty-one".