40812811521221 has 8 divisors (see below), whose sum is σ = 41984238743544. Its totient is φ = 39644983154880.

The previous prime is 40812811521199. The next prime is 40812811521301. The reversal of 40812811521221 is 12212511821804.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 694078936996 + 40118732584225 = 833114^2 + 6333935^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40812811521221 is a prime.

It is a super-2 number, since 2×40812811521221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40812811521121) 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, 899690990 + ... + 899736351.

It is an arithmetic number, because the mean of its divisors is an integer number (5248029842943).

Almost surely, 2^{40812811521221} is an apocalyptic number.

It is an amenable number.

40812811521221 is a deficient number, since it is larger than the sum of its proper divisors (1171427222323).

40812811521221 is a wasteful number, since it uses less digits than its factorization.

40812811521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799427991.

The product of its (nonzero) digits is 20480, while the sum is 38.

The spelling of 40812811521221 in words is "forty trillion, eight hundred twelve billion, eight hundred eleven million, five hundred twenty-one thousand, two hundred twenty-one".