42121144357455 has 16 divisors (see below), whose sum is σ = 68961129367680. Its totient is φ = 21942177525408.

The previous prime is 42121144357433. The next prime is 42121144357529. The reversal of 42121144357455 is 55475344112124.

It is a happy number.

It is not a de Polignac number, because 42121144357455 - 2¹⁸ = 42121144095311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32652049245 + ... + 32652050534.

It is an arithmetic number, because the mean of its divisors is an integer number (4310070585480).

Almost surely, 2^{42121144357455} is an apocalyptic number.

42121144357455 is a deficient number, since it is larger than the sum of its proper divisors (26839985010225).

42121144357455 is a wasteful number, since it uses less digits than its factorization.

42121144357455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65304099830.

The product of its digits is 2688000, while the sum is 48.

Adding to 42121144357455 its reverse (55475344112124), we get a palindrome (97596488469579).

The spelling of 42121144357455 in words is "forty-two trillion, one hundred twenty-one billion, one hundred forty-four million, three hundred fifty-seven thousand, four hundred fifty-five".