1021012221 has 8 divisors (see below), whose sum is σ = 1361665984. Its totient is φ = 680516640.

The previous prime is 1021012207. The next prime is 1021012229. The reversal of 1021012221 is 1222101201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021012221 - 2⁷ = 1021012093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021012197 and 1021012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021012229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23560 + ... + 50961.

It is an arithmetic number, because the mean of its divisors is an integer number (170208248).

Almost surely, 2^1021012221 is an apocalyptic number.

It is an amenable number.

1021012221 is a deficient number, since it is larger than the sum of its proper divisors (340653763).

1021012221 is an equidigital number, since it uses as much as digits as its factorization.

1021012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79091.

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

The square root of 1021012221 is about 31953.2818502263. The cubic root of 1021012221 is about 1006.9555813837.

Adding to 1021012221 its reverse (1222101201), we get a palindrome (2243113422).

The spelling of 1021012221 in words is "one billion, twenty-one million, twelve thousand, two hundred twenty-one".