2191403620 has 24 divisors (see below), whose sum is σ = 5259369024. Its totient is φ = 751338336.

The previous prime is 2191403603. The next prime is 2191403633. The reversal of 2191403620 is 263041912.

It is a Harshad number since it is a multiple of its sum of digits (28).

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 7 ways as a sum of consecutive naturals, for example, 7826302 + ... + 7826581.

It is an arithmetic number, because the mean of its divisors is an integer number (219140376).

Almost surely, 2^2191403620 is an apocalyptic number.

2191403620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191403620 is an abundant number, since it is smaller than the sum of its proper divisors (3067965404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191403620 is a wasteful number, since it uses less digits than its factorization.

2191403620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15652899 (or 15652897 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2191403620 is about 46812.4301868638. The cubic root of 2191403620 is about 1298.8952389369.

The spelling of 2191403620 in words is "two billion, one hundred ninety-one million, four hundred three thousand, six hundred twenty".