40121621564743 has 4 divisors (see below), whose sum is σ = 40181237645008. Its totient is φ = 40062005484480.

The previous prime is 40121621564741. The next prime is 40121621564747. The reversal of 40121621564743 is 34746512612104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40121621564743 - 2¹ = 40121621564741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40121621564693 and 40121621564702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121621564741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29808039123 + ... + 29808040468.

It is an arithmetic number, because the mean of its divisors is an integer number (10045309411252).

Almost surely, 2^{40121621564743} is an apocalyptic number.

40121621564743 is a deficient number, since it is larger than the sum of its proper divisors (59616080265).

40121621564743 is an equidigital number, since it uses as much as digits as its factorization.

40121621564743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59616080264.

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 40121621564743 in words is "forty trillion, one hundred twenty-one billion, six hundred twenty-one million, five hundred sixty-four thousand, seven hundred forty-three".