21221592270 has 32 divisors (see below), whose sum is σ = 50936573952. Its totient is φ = 5658563232.

The previous prime is 21221592209. The next prime is 21221592299. The reversal of 21221592270 is 7229512212.

21221592270 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 377619 + ... + 430161.

It is an arithmetic number, because the mean of its divisors is an integer number (1591767936).

Almost surely, 2^21221592270 is an apocalyptic number.

21221592270 is an abundant number, since it is smaller than the sum of its proper divisors (29714981682).

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

21221592270 is a wasteful number, since it uses less digits than its factorization.

21221592270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66016.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 21221592270 in words is "twenty-one billion, two hundred twenty-one million, five hundred ninety-two thousand, two hundred seventy".