21550124 has 12 divisors (see below), whose sum is σ = 37745400. Its totient is φ = 10765728.

The previous prime is 21550099. The next prime is 21550127. The reversal of 21550124 is 42105512.

It is a junction number, because it is equal to n+sod(n) for n = 21550096 and 21550105.

It is not an unprimeable number, because it can be changed into a prime (21550127) 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, 7067 + ... + 9645.

It is an arithmetic number, because the mean of its divisors is an integer number (3145450).

Almost surely, 2^21550124 is an apocalyptic number.

It is an amenable number.

21550124 is a deficient number, since it is larger than the sum of its proper divisors (16195276).

21550124 is a wasteful number, since it uses less digits than its factorization.

21550124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4672 (or 4670 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 21550124 is about 4642.2111110978. The cubic root of 21550124 is about 278.2808093685.

Adding to 21550124 its reverse (42105512), we get a palindrome (63655636).

The spelling of 21550124 in words is "twenty-one million, five hundred fifty thousand, one hundred twenty-four".