1210221021 has 8 divisors (see below), whose sum is σ = 1631759040. Its totient is φ = 797748512.

The previous prime is 1210221013. The next prime is 1210221037. The reversal of 1210221021 is 1201220121.

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

It is a cyclic number.

It is not a de Polignac number, because 1210221021 - 2³ = 1210221013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210220988 and 1210221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210228021) 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, 2266065 + ... + 2266598.

It is an arithmetic number, because the mean of its divisors is an integer number (203969880).

Almost surely, 2^1210221021 is an apocalyptic number.

It is an amenable number.

1210221021 is a deficient number, since it is larger than the sum of its proper divisors (421538019).

1210221021 is an equidigital number, since it uses as much as digits as its factorization.

1210221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4532755.

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

The square root of 1210221021 is about 34788.2310702916. The cubic root of 1210221021 is about 1065.6671144893.

Adding to 1210221021 its reverse (1201220121), we get a palindrome (2411441142).

The spelling of 1210221021 in words is "one billion, two hundred ten million, two hundred twenty-one thousand, twenty-one".