2188870521 has 8 divisors (see below), whose sum is σ = 2919254784. Its totient is φ = 1458866640.

The previous prime is 2188870517. The next prime is 2188870553. The reversal of 2188870521 is 1250788812.

2188870521 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2188870521 - 2² = 2188870517 is a prime.

It is a super-2 number, since 2×2188870521² = 9582308315405622882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2188870571) 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, 81385 + ... + 104886.

It is an arithmetic number, because the mean of its divisors is an integer number (364906848).

Almost surely, 2^2188870521 is an apocalyptic number.

It is an amenable number.

2188870521 is a deficient number, since it is larger than the sum of its proper divisors (730384263).

2188870521 is a wasteful number, since it uses less digits than its factorization.

2188870521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190191.

The product of its (nonzero) digits is 71680, while the sum is 42.

The square root of 2188870521 is about 46785.3665262975. The cubic root of 2188870521 is about 1298.3945706637.

The spelling of 2188870521 in words is "two billion, one hundred eighty-eight million, eight hundred seventy thousand, five hundred twenty-one".