40166512211021 has 16 divisors (see below), whose sum is σ = 50172753669120. Its totient is φ = 31357971037440.

The previous prime is 40166512211009. The next prime is 40166512211047. The reversal of 40166512211021 is 12011221566104.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40166512211021 - 2³⁴ = 40149332341837 is a prime.

It is a super-2 number, since 2×40166512211021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40166512217021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5444088506 + ... + 5444095883.

It is an arithmetic number, because the mean of its divisors is an integer number (3135797104320).

Almost surely, 2^{40166512211021} is an apocalyptic number.

It is an amenable number.

40166512211021 is a deficient number, since it is larger than the sum of its proper divisors (10006241458099).

40166512211021 is a wasteful number, since it uses less digits than its factorization.

40166512211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10888184444.

The product of its (nonzero) digits is 5760, while the sum is 32.

Adding to 40166512211021 its reverse (12011221566104), we get a palindrome (52177733777125).

The spelling of 40166512211021 in words is "forty trillion, one hundred sixty-six billion, five hundred twelve million, two hundred eleven thousand, twenty-one".