1010101221 has 24 divisors (see below), whose sum is σ = 1503081944. Its totient is φ = 653184000.

The previous prime is 1010101193. The next prime is 1010101273. The reversal of 1010101221 is 1221010101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 103428900 + 906672321 = 10170^2 + 30111^2 .

It is not a de Polignac number, because 1010101221 - 2⁷ = 1010101093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010101321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107721 + ... + 116721.

Almost surely, 2^1010101221 is an apocalyptic number.

It is an amenable number.

1010101221 is a deficient number, since it is larger than the sum of its proper divisors (492980723).

1010101221 is a wasteful number, since it uses less digits than its factorization.

1010101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9381 (or 9378 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1010101221 is about 31782.0896260771. The cubic root of 1010101221 is about 1003.3557996782.

Adding to 1010101221 its reverse (1221010101), we get a palindrome (2231111322).

The spelling of 1010101221 in words is "one billion, ten million, one hundred one thousand, two hundred twenty-one".