21434154 has 32 divisors (see below), whose sum is σ = 49921920. Its totient is φ = 6007872.

The previous prime is 21434143. The next prime is 21434159. The reversal of 21434154 is 45143412.

It is not an unprimeable number, because it can be changed into a prime (21434159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2589 + ... + 7040.

It is an arithmetic number, because the mean of its divisors is an integer number (1560060).

Almost surely, 2^21434154 is an apocalyptic number.

21434154 is an abundant number, since it is smaller than the sum of its proper divisors (28487766).

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

21434154 is a wasteful number, since it uses less digits than its factorization.

21434154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9694.

The product of its digits is 1920, while the sum is 24.

The square root of 21434154 is about 4629.7034462263. The cubic root of 21434154 is about 277.7807304338.

Adding to 21434154 its reverse (45143412), we get a palindrome (66577566).

The spelling of 21434154 in words is "twenty-one million, four hundred thirty-four thousand, one hundred fifty-four".