42021666126503 has 32 divisors (see below), whose sum is σ = 50679638438400. Its totient is φ = 34036969595904.

The previous prime is 42021666126499. The next prime is 42021666126569. The reversal of 42021666126503 is 30562166612024.

It is a happy number.

It is not a de Polignac number, because 42021666126503 - 2² = 42021666126499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021666126103) 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, 1396192751 + ... + 1396222847.

It is an arithmetic number, because the mean of its divisors is an integer number (1583738701200).

Almost surely, 2^{42021666126503} is an apocalyptic number.

42021666126503 is a deficient number, since it is larger than the sum of its proper divisors (8657972311897).

42021666126503 is a wasteful number, since it uses less digits than its factorization.

42021666126503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56199.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 42021666126503 in words is "forty-two trillion, twenty-one billion, six hundred sixty-six million, one hundred twenty-six thousand, five hundred three".