4012013021 has 4 divisors (see below), whose sum is σ = 4014090492. Its totient is φ = 4009935552.

The previous prime is 4012013003. The next prime is 4012013041. The reversal of 4012013021 is 1203102104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2946969796 + 1065043225 = 54286^2 + 32635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4012013021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4012012987 and 4012013005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4012013041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1035836 + ... + 1039701.

It is an arithmetic number, because the mean of its divisors is an integer number (1003522623).

Almost surely, 2^4012013021 is an apocalyptic number.

It is an amenable number.

4012013021 is a deficient number, since it is larger than the sum of its proper divisors (2077471).

4012013021 is a wasteful number, since it uses less digits than its factorization.

4012013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077470.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 4012013021 is about 63340.4532743491. The cubic root of 4012013021 is about 1588.9885872837.

Adding to 4012013021 its reverse (1203102104), we get a palindrome (5215115125).

The spelling of 4012013021 in words is "four billion, twelve million, thirteen thousand, twenty-one".