40126156723221 has 8 divisors (see below), whose sum is σ = 53556303347904. Its totient is φ = 26723390623680.

The previous prime is 40126156723117. The next prime is 40126156723241. The reversal of 40126156723221 is 12232765162104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40126156723221 - 2²¹ = 40126154626069 is a prime.

It is a super-2 number, since 2×40126156723221² (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 (40126156723241) 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, 6845127865 + ... + 6845133726.

It is an arithmetic number, because the mean of its divisors is an integer number (6694537918488).

Almost surely, 2^{40126156723221} is an apocalyptic number.

It is an amenable number.

40126156723221 is a deficient number, since it is larger than the sum of its proper divisors (13430146624683).

40126156723221 is a wasteful number, since it uses less digits than its factorization.

40126156723221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13690262571.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 40126156723221 in words is "forty trillion, one hundred twenty-six billion, one hundred fifty-six million, seven hundred twenty-three thousand, two hundred twenty-one".