21230078 has 4 divisors (see below), whose sum is σ = 31845120. Its totient is φ = 10615038.

The previous prime is 21230047. The next prime is 21230123. The reversal of 21230078 is 87003212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307518 + ... + 5307521.

It is an arithmetic number, because the mean of its divisors is an integer number (7961280).

Almost surely, 2^21230078 is an apocalyptic number.

21230078 is a deficient number, since it is larger than the sum of its proper divisors (10615042).

21230078 is a wasteful number, since it uses less digits than its factorization.

21230078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615041.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21230078 is about 4607.6108776675. The cubic root of 21230078 is about 276.8963280708.

The spelling of 21230078 in words is "twenty-one million, two hundred thirty thousand, seventy-eight".