2178220190 has 16 divisors (see below), whose sum is σ = 3925484640. Its totient is φ = 870246240.

The previous prime is 2178220181. The next prime is 2178220201. The reversal of 2178220190 is 910228712.

It is a happy number.

It is a super-2 number, since 2×2178220190² = 9489286392247272200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121421 + ... + 138200.

It is an arithmetic number, because the mean of its divisors is an integer number (245342790).

Almost surely, 2^2178220190 is an apocalyptic number.

2178220190 is a deficient number, since it is larger than the sum of its proper divisors (1747264450).

2178220190 is a wasteful number, since it uses less digits than its factorization.

2178220190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260467.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 2178220190 is about 46671.4065569059. The cubic root of 2178220190 is about 1296.2852909095.

The spelling of 2178220190 in words is "two billion, one hundred seventy-eight million, two hundred twenty thousand, one hundred ninety".