40012121556105 has 16 divisors (see below), whose sum is σ = 64019497685760. Its totient is φ = 21339763764608.

The previous prime is 40012121555999. The next prime is 40012121556119. The reversal of 40012121556105 is 50165512121004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40012121556105 - 2¹⁸ = 40012121293961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9503341 + ... + 13051349.

It is an arithmetic number, because the mean of its divisors is an integer number (4001218605360).

Almost surely, 2^{40012121556105} is an apocalyptic number.

It is an amenable number.

40012121556105 is a deficient number, since it is larger than the sum of its proper divisors (24007376129655).

40012121556105 is a wasteful number, since it uses less digits than its factorization.

40012121556105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299840.

The product of its (nonzero) digits is 12000, while the sum is 33.

Adding to 40012121556105 its reverse (50165512121004), we get a palindrome (90177633677109).

The spelling of 40012121556105 in words is "forty trillion, twelve billion, one hundred twenty-one million, five hundred fifty-six thousand, one hundred five".