42021142551 has 8 divisors (see below), whose sum is σ = 62253544560. Its totient is φ = 28014095016.

The previous prime is 42021142549. The next prime is 42021142571. The reversal of 42021142551 is 15524112024.

It is a happy number.

42021142551 is a `hidden beast` number, since 4 + 20 + 211 + 425 + 5 + 1 = 666.

It is not a de Polignac number, because 42021142551 - 2¹ = 42021142549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1556338613 = 42021142551 / (4 + 2 + 0 + 2 + 1 + 1 + 4 + 2 + 5 + 5 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021142571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 778169280 + ... + 778169333.

It is an arithmetic number, because the mean of its divisors is an integer number (7781693070).

Almost surely, 2^42021142551 is an apocalyptic number.

42021142551 is a deficient number, since it is larger than the sum of its proper divisors (20232402009).

42021142551 is a wasteful number, since it uses less digits than its factorization.

42021142551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556338622 (or 1556338616 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 42021142551 its reverse (15524112024), we get a palindrome (57545254575).

The spelling of 42021142551 in words is "forty-two billion, twenty-one million, one hundred forty-two thousand, five hundred fifty-one".