21223232078 has 8 divisors (see below), whose sum is σ = 31847374368. Its totient is φ = 10607440624.

The previous prime is 21223232077. The next prime is 21223232101. The reversal of 21223232078 is 87023232212.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223232071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081351 + ... + 2091522.

It is an arithmetic number, because the mean of its divisors is an integer number (3980921796).

Almost surely, 2^21223232078 is an apocalyptic number.

21223232078 is a deficient number, since it is larger than the sum of its proper divisors (10624142290).

21223232078 is a wasteful number, since it uses less digits than its factorization.

21223232078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175418.

The product of its (nonzero) digits is 16128, while the sum is 32.

The spelling of 21223232078 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty-two thousand, seventy-eight".