40202312121 has 20 divisors (see below), whose sum is σ = 61333084032. Its totient is φ = 26231293368.

The previous prime is 40202312119. The next prime is 40202312167. The reversal of 40202312121 is 12121320204.

It is a happy number.

It is not a de Polignac number, because 40202312121 - 2¹ = 40202312119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40202312094 and 40202312103.

It is not an unprimeable number, because it can be changed into a prime (40202312921) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5276245 + ... + 5283858.

Almost surely, 2^40202312121 is an apocalyptic number.

It is an amenable number.

40202312121 is a deficient number, since it is larger than the sum of its proper divisors (21130771911).

40202312121 is a wasteful number, since it uses less digits than its factorization.

40202312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560162 (or 10560153 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 40202312121 its reverse (12121320204), we get a palindrome (52323632325).

The spelling of 40202312121 in words is "forty billion, two hundred two million, three hundred twelve thousand, one hundred twenty-one".