40121621564745 has 32 divisors (see below), whose sum is σ = 74121593672448. Its totient is φ = 18152227012608.

The previous prime is 40121621564741. The next prime is 40121621564747. The reversal of 40121621564745 is 54746512612104.

It is a happy number.

It is not a de Polignac number, because 40121621564745 - 2² = 40121621564741 is a prime.

It is a super-2 number, since 2×40121621564745² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40121621564694 and 40121621564703.

It is not an unprimeable number, because it can be changed into a prime (40121621564741) 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 31 ways as a sum of consecutive naturals, for example, 1969632504 + ... + 1969652873.

It is an arithmetic number, because the mean of its divisors is an integer number (2316299802264).

Almost surely, 2^{40121621564745} is an apocalyptic number.

It is an amenable number.

40121621564745 is a deficient number, since it is larger than the sum of its proper divisors (33999972107703).

40121621564745 is a wasteful number, since it uses less digits than its factorization.

40121621564745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939285489.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 40121621564745 in words is "forty trillion, one hundred twenty-one billion, six hundred twenty-one million, five hundred sixty-four thousand, seven hundred forty-five".