21154124 has 12 divisors (see below), whose sum is σ = 37071048. Its totient is φ = 10562400.

The previous prime is 21154123. The next prime is 21154139. The reversal of 21154124 is 42145112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21154096 and 21154105.

It is not an unprimeable number, because it can be changed into a prime (21154123) 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, 17 + ... + 6504.

It is an arithmetic number, because the mean of its divisors is an integer number (3089254).

Almost surely, 2^21154124 is an apocalyptic number.

It is an amenable number.

21154124 is a deficient number, since it is larger than the sum of its proper divisors (15916924).

21154124 is a wasteful number, since it uses less digits than its factorization.

21154124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336 (or 7334 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 21154124 is about 4599.3612600012. The cubic root of 21154124 is about 276.5657198536.

Adding to 21154124 its reverse (42145112), we get a palindrome (63299236).

It can be divided in two parts, 2115412 and 4, that multiplied together give a palindrome (8461648).

The spelling of 21154124 in words is "twenty-one million, one hundred fifty-four thousand, one hundred twenty-four".