4001223121 has 8 divisors (see below), whose sum is σ = 4614779840. Its totient is φ = 3398154768.

The previous prime is 4001223113. The next prime is 4001223133. The reversal of 4001223121 is 1213221004.

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 4001223121 - 2³ = 4001223113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4001223095 and 4001223104.

It is not an unprimeable number, because it can be changed into a prime (4001223101) 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, 2621271 + ... + 2622796.

It is an arithmetic number, because the mean of its divisors is an integer number (576847480).

Almost surely, 2^4001223121 is an apocalyptic number.

It is an amenable number.

4001223121 is a deficient number, since it is larger than the sum of its proper divisors (613556719).

4001223121 is a wasteful number, since it uses less digits than its factorization.

4001223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244183.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 4001223121 is about 63255.2220848208. Note that the first 3 decimals coincide. The cubic root of 4001223121 is about 1587.5628341096.

Adding to 4001223121 its reverse (1213221004), we get a palindrome (5214444125).

The spelling of 4001223121 in words is "four billion, one million, two hundred twenty-three thousand, one hundred twenty-one".