21755046 has 16 divisors (see below), whose sum is σ = 45010800. Its totient is φ = 7001568.

The previous prime is 21755021. The next prime is 21755077. The reversal of 21755046 is 64055712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62341 + ... + 62688.

It is an arithmetic number, because the mean of its divisors is an integer number (2813175).

Almost surely, 2^21755046 is an apocalyptic number.

21755046 is an abundant number, since it is smaller than the sum of its proper divisors (23255754).

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

21755046 is a wasteful number, since it uses less digits than its factorization.

21755046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125063.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 21755046 is about 4664.2304831558. The cubic root of 21755046 is about 279.1600936251.

The spelling of 21755046 in words is "twenty-one million, seven hundred fifty-five thousand, forty-six".