40400244242221 has 4 divisors (see below), whose sum is σ = 41492142735292. Its totient is φ = 39308345749152.

The previous prime is 40400244242203. The next prime is 40400244242291. The reversal of 40400244242221 is 12224244200404.

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 24245913872196 + 16154330370025 = 4924014^2 + 4019245^2 .

It is a cyclic number.

It is not a de Polignac number, because 40400244242221 - 2³³ = 40391654307629 is a prime.

It is a super-2 number, since 2×40400244242221² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40400244242291) 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, 545949246480 + ... + 545949246553.

It is an arithmetic number, because the mean of its divisors is an integer number (10373035683823).

Almost surely, 2^{40400244242221} is an apocalyptic number.

It is an amenable number.

40400244242221 is a deficient number, since it is larger than the sum of its proper divisors (1091898493071).

40400244242221 is a wasteful number, since it uses less digits than its factorization.

40400244242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091898493070.

The product of its (nonzero) digits is 32768, while the sum is 31.

Adding to 40400244242221 its reverse (12224244200404), we get a palindrome (52624488442625).

The spelling of 40400244242221 in words is "forty trillion, four hundred billion, two hundred forty-four million, two hundred forty-two thousand, two hundred twenty-one".