42210861 has 32 divisors (see below), whose sum is σ = 70502400. Its totient is φ = 21823680.

The previous prime is 42210859. The next prime is 42210869. The reversal of 42210861 is 16801224.

It is not a de Polignac number, because 42210861 - 2¹ = 42210859 is a prime.

It is a super-2 number, since 2×42210861² = 3563513572722642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42210869) 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, 82675 + ... + 83183.

It is an arithmetic number, because the mean of its divisors is an integer number (2203200).

Almost surely, 2^42210861 is an apocalyptic number.

It is an amenable number.

42210861 is a deficient number, since it is larger than the sum of its proper divisors (28291539).

42210861 is a wasteful number, since it uses less digits than its factorization.

42210861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 42210861 is about 6496.9886101178. The cubic root of 42210861 is about 348.1834067571.

It can be divided in two parts, 42210 and 861, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 42210861 in words is "forty-two million, two hundred ten thousand, eight hundred sixty-one".