40545511021 has 4 divisors (see below), whose sum is σ = 40668005344. Its totient is φ = 40423016700.

The previous prime is 40545510989. The next prime is 40545511067. The reversal of 40545511021 is 12011554504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40545511021 - 2⁵ = 40545510989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40545518021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61246665 + ... + 61247326.

It is an arithmetic number, because the mean of its divisors is an integer number (10167001336).

Almost surely, 2^40545511021 is an apocalyptic number.

It is an amenable number.

40545511021 is a deficient number, since it is larger than the sum of its proper divisors (122494323).

40545511021 is a wasteful number, since it uses less digits than its factorization.

40545511021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122494322.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 40545511021 in words is "forty billion, five hundred forty-five million, five hundred eleven thousand, twenty-one".