2191207920 has 80 divisors (see below), whose sum is σ = 7410275712. Its totient is φ = 531201280.

The previous prime is 2191207873. The next prime is 2191208011. The reversal of 2191207920 is 297021912.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412362 + ... + 417641.

Almost surely, 2^2191207920 is an apocalyptic number.

2191207920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191207920 is an abundant number, since it is smaller than the sum of its proper divisors (5219067792).

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

2191207920 is a wasteful number, since it uses less digits than its factorization.

2191207920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830030 (or 830024 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 2191207920 is about 46810.3398834061. The cubic root of 2191207920 is about 1298.8565724915.

The spelling of 2191207920 in words is "two billion, one hundred ninety-one million, two hundred seven thousand, nine hundred twenty".