42261645621 has 24 divisors (see below), whose sum is σ = 62985121536. Its totient is φ = 25168216320.

The previous prime is 42261645611. The next prime is 42261645631. The reversal of 42261645621 is 12654616224.

It is an interprime number because it is at equal distance from previous prime (42261645611) and next prime (42261645631).

It is not a de Polignac number, because 42261645621 - 2⁵ = 42261645589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 42261645621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42261645611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1328740 + ... + 1360173.

It is an arithmetic number, because the mean of its divisors is an integer number (2624380064).

Almost surely, 2^42261645621 is an apocalyptic number.

It is an amenable number.

42261645621 is a deficient number, since it is larger than the sum of its proper divisors (20723475915).

42261645621 is a wasteful number, since it uses less digits than its factorization.

42261645621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688973 (or 2688960 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The spelling of 42261645621 in words is "forty-two billion, two hundred sixty-one million, six hundred forty-five thousand, six hundred twenty-one".