2221721870 has 32 divisors (see below), whose sum is σ = 4278610080. Its totient is φ = 828109440.

The previous prime is 2221721861. The next prime is 2221721897. The reversal of 2221721870 is 781271222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84257 + ... + 107436.

It is an arithmetic number, because the mean of its divisors is an integer number (133706565).

Almost surely, 2^2221721870 is an apocalyptic number.

2221721870 is a deficient number, since it is larger than the sum of its proper divisors (2056888210).

2221721870 is a wasteful number, since it uses less digits than its factorization.

2221721870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191780.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 2221721870 is about 47135.1447435987. The cubic root of 2221721870 is about 1304.8579324018.

The spelling of 2221721870 in words is "two billion, two hundred twenty-one million, seven hundred twenty-one thousand, eight hundred seventy".