21055126 has 8 divisors (see below), whose sum is σ = 32100624. Its totient is φ = 10354920.

The previous prime is 21055123. The next prime is 21055141. The reversal of 21055126 is 62155012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21055097 and 21055106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21055123) 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, 86170 + ... + 86413.

It is an arithmetic number, because the mean of its divisors is an integer number (4012578).

Almost surely, 2^21055126 is an apocalyptic number.

21055126 is a deficient number, since it is larger than the sum of its proper divisors (11045498).

21055126 is a wasteful number, since it uses less digits than its factorization.

21055126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172646.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 21055126 is about 4588.5864925922. The cubic root of 21055126 is about 276.1336169525.

The spelling of 21055126 in words is "twenty-one million, fifty-five thousand, one hundred twenty-six".