21725078 has 8 divisors (see below), whose sum is σ = 32954040. Its totient is φ = 10740400.

The previous prime is 21725063. The next prime is 21725101. The reversal of 21725078 is 87052712.

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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60848 + ... + 61203.

It is an arithmetic number, because the mean of its divisors is an integer number (4119255).

Almost surely, 2^21725078 is an apocalyptic number.

21725078 is a deficient number, since it is larger than the sum of its proper divisors (11228962).

21725078 is a wasteful number, since it uses less digits than its factorization.

21725078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122142.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 21725078 is about 4661.0168418490. The cubic root of 21725078 is about 279.0318518981.

The spelling of 21725078 in words is "twenty-one million, seven hundred twenty-five thousand, seventy-eight".