40003212121 has 4 divisors (see below), whose sum is σ = 40017315492. Its totient is φ = 39989108752.

The previous prime is 40003212101. The next prime is 40003212149. The reversal of 40003212121 is 12121230004.

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 20386128400 + 19617083721 = 142780^2 + 140061^2 .

It is a cyclic number.

It is not a de Polignac number, because 40003212121 - 2²¹ = 40001114969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40003212095 and 40003212104.

It is not an unprimeable number, because it can be changed into a prime (40003212101) 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, 7047430 + ... + 7053103.

It is an arithmetic number, because the mean of its divisors is an integer number (10004328873).

Almost surely, 2^40003212121 is an apocalyptic number.

It is an amenable number.

40003212121 is a deficient number, since it is larger than the sum of its proper divisors (14103371).

40003212121 is a wasteful number, since it uses less digits than its factorization.

40003212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14103370.

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

Adding to 40003212121 its reverse (12121230004), we get a palindrome (52124442125).

The spelling of 40003212121 in words is "forty billion, three million, two hundred twelve thousand, one hundred twenty-one".