21150126 has 32 divisors (see below), whose sum is σ = 47174400. Its totient is φ = 7023960.

The previous prime is 21150121. The next prime is 21150139. The reversal of 21150126 is 62105112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21150099 and 21150108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18841 + ... + 19931.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^21150126 is an apocalyptic number.

21150126 is an abundant number, since it is smaller than the sum of its proper divisors (26024274).

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

21150126 is a wasteful number, since it uses less digits than its factorization.

21150126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461 (or 1455 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 21150126 is about 4598.9266138959. The cubic root of 21150126 is about 276.5482956796.

Adding to 21150126 its reverse (62105112), we get a palindrome (83255238).

The spelling of 21150126 in words is "twenty-one million, one hundred fifty thousand, one hundred twenty-six".