42821623731 has 32 divisors (see below), whose sum is σ = 63283286016. Its totient is φ = 25635456000.

The previous prime is 42821623729. The next prime is 42821623781. The reversal of 42821623731 is 13732612824.

It is not a de Polignac number, because 42821623731 - 2¹ = 42821623729 is a prime.

It is a super-2 number, since 2×42821623731² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42821623731.

It is not an unprimeable number, because it can be changed into a prime (42821623781) 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, 78490 + ... + 302991.

It is an arithmetic number, because the mean of its divisors is an integer number (1977602688).

Almost surely, 2^42821623731 is an apocalyptic number.

42821623731 is a deficient number, since it is larger than the sum of its proper divisors (20461662285).

42821623731 is a wasteful number, since it uses less digits than its factorization.

42821623731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381603.

The product of its digits is 96768, while the sum is 39.

The spelling of 42821623731 in words is "forty-two billion, eight hundred twenty-one million, six hundred twenty-three thousand, seven hundred thirty-one".