21010124 has 12 divisors (see below), whose sum is σ = 38703000. Its totient is φ = 9952128.

The previous prime is 21010111. The next prime is 21010127. The reversal of 21010124 is 42101012.

It is not an unprimeable number, because it can be changed into a prime (21010127) 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, 138149 + ... + 138300.

It is an arithmetic number, because the mean of its divisors is an integer number (3225250).

Almost surely, 2^21010124 is an apocalyptic number.

It is an amenable number.

21010124 is a deficient number, since it is larger than the sum of its proper divisors (17692876).

21010124 is a wasteful number, since it uses less digits than its factorization.

21010124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276472 (or 276470 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21010124 is about 4583.6801808154. The cubic root of 21010124 is about 275.9367459890.

Adding to 21010124 its reverse (42101012), we get a palindrome (63111136).

It can be divided in two parts, 2101012 and 4, that multiplied together give a palindrome (8404048).

The spelling of 21010124 in words is "twenty-one million, ten thousand, one hundred twenty-four".