1021223121 has 16 divisors (see below), whose sum is σ = 1400034048. Its totient is φ = 661737600.

The previous prime is 1021223107. The next prime is 1021223141. The reversal of 1021223121 is 1213221201.

It is not a de Polignac number, because 1021223121 - 2⁵ = 1021223089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021223121.

It is not an unprimeable number, because it can be changed into a prime (1021223101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18015 + ... + 48651.

It is an arithmetic number, because the mean of its divisors is an integer number (87502128).

Almost surely, 2^1021223121 is an apocalyptic number.

It is an amenable number.

1021223121 is a deficient number, since it is larger than the sum of its proper divisors (378810927).

1021223121 is a wasteful number, since it uses less digits than its factorization.

1021223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30952.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1021223121 is about 31956.5818103251. The cubic root of 1021223121 is about 1007.0249087653.

Adding to 1021223121 its reverse (1213221201), we get a palindrome (2234444322).

It can be divided in two parts, 10212 and 23121, that added together give a palindrome (33333).

The spelling of 1021223121 in words is "one billion, twenty-one million, two hundred twenty-three thousand, one hundred twenty-one".