2221870 has 16 divisors (see below), whose sum is σ = 4570848. Its totient is φ = 761760.

The previous prime is 2221861. The next prime is 2221871. The reversal of 2221870 is 781222.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221871) 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, 15801 + ... + 15940.

It is an arithmetic number, because the mean of its divisors is an integer number (285678).

2^2221870 is an apocalyptic number.

2221870 is an abundant number, since it is smaller than the sum of its proper divisors (2348978).

2221870 is a wasteful number, since it uses less digits than its factorization.

2221870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31755.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2221870 is about 1490.5938413934. The cubic root of 2221870 is about 130.4886931578.

The spelling of 2221870 in words is "two million, two hundred twenty-one thousand, eight hundred seventy".