4012420121 has 8 divisors (see below), whose sum is σ = 4249177704. Its totient is φ = 3775744000.

The previous prime is 4012420103. The next prime is 4012420123. The reversal of 4012420121 is 1210242104.

4012420121 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 347449600 + 3664970521 = 18640^2 + 60539^2 .

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 4012420121 - 2²⁶ = 3945311257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4012420121.

It is not an unprimeable number, because it can be changed into a prime (4012420123) 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, 102161 + ... + 135873.

It is an arithmetic number, because the mean of its divisors is an integer number (531147213).

Almost surely, 2^4012420121 is an apocalyptic number.

It is an amenable number.

4012420121 is a deficient number, since it is larger than the sum of its proper divisors (236757583).

4012420121 is a wasteful number, since it uses less digits than its factorization.

4012420121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40731.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 4012420121 is about 63343.6667789291. Note that the first 3 decimals coincide. The cubic root of 4012420121 is about 1589.0423304938.

Adding to 4012420121 its reverse (1210242104), we get a palindrome (5222662225).

The spelling of 4012420121 in words is "four billion, twelve million, four hundred twenty thousand, one hundred twenty-one".