1021210221 has 8 divisors (see below), whose sum is σ = 1362538944. Its totient is φ = 680344160.

The previous prime is 1021210133. The next prime is 1021210231. The reversal of 1021210221 is 1220121201.

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 1021210221 - 2¹⁴ = 1021193837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021210197 and 1021210206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210231) 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, 110481 + ... + 119366.

It is an arithmetic number, because the mean of its divisors is an integer number (170317368).

Almost surely, 2^1021210221 is an apocalyptic number.

It is an amenable number.

1021210221 is a deficient number, since it is larger than the sum of its proper divisors (341328723).

1021210221 is a wasteful number, since it uses less digits than its factorization.

1021210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231331.

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

The square root of 1021210221 is about 31956.3799733324. The cubic root of 1021210221 is about 1007.0206685310.

Adding to 1021210221 its reverse (1220121201), we get a palindrome (2241331422).

The spelling of 1021210221 in words is "one billion, twenty-one million, two hundred ten thousand, two hundred twenty-one".