40421340204021 has 32 divisors (see below), whose sum is σ = 68977131847680. Its totient is φ = 22916035377648.

The previous prime is 40421340203963. The next prime is 40421340204043. The reversal of 40421340204021 is 12040204312404.

40421340204021 is a `hidden beast` number, since 4 + 0 + 4 + 213 + 40 + 2 + 0 + 402 + 1 = 666.

It is not a de Polignac number, because 40421340204021 - 2¹⁴ = 40421340187637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40421340204121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 841982001 + ... + 842030006.

It is an arithmetic number, because the mean of its divisors is an integer number (2155535370240).

Almost surely, 2^{40421340204021} is an apocalyptic number.

It is an amenable number.

40421340204021 is a deficient number, since it is larger than the sum of its proper divisors (28555791643659).

40421340204021 is a wasteful number, since it uses less digits than its factorization.

40421340204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684012150 (or 1684012144 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 40421340204021 its reverse (12040204312404), we get a palindrome (52461544516425).

The spelling of 40421340204021 in words is "forty trillion, four hundred twenty-one billion, three hundred forty million, two hundred four thousand, twenty-one".