21124898 has 16 divisors (see below), whose sum is σ = 32191776. Its totient is φ = 10395840.

The previous prime is 21124877. The next prime is 21124927. The reversal of 21124898 is 89842112.

It is a super-2 number, since 2×21124898² = 892522631020808, which contains 22 as substring.

It is a Curzon 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, 47465 + ... + 47907.

It is an arithmetic number, because the mean of its divisors is an integer number (2011986).

Almost surely, 2^21124898 is an apocalyptic number.

21124898 is a deficient number, since it is larger than the sum of its proper divisors (11066878).

21124898 is a wasteful number, since it uses less digits than its factorization.

21124898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769.

The product of its digits is 9216, while the sum is 35.

The square root of 21124898 is about 4596.1829815620. The cubic root of 21124898 is about 276.4382957641.

It can be divided in two parts, 21124 and 898, that added together give a palindrome (22022).

The spelling of 21124898 in words is "twenty-one million, one hundred twenty-four thousand, eight hundred ninety-eight".