21451254 has 16 divisors (see below), whose sum is σ = 46802880. Its totient is φ = 6500360.

The previous prime is 21451237. The next prime is 21451277. The reversal of 21451254 is 45215412.

It is a congruent 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, 162444 + ... + 162575.

It is an arithmetic number, because the mean of its divisors is an integer number (2925180).

Almost surely, 2^21451254 is an apocalyptic number.

21451254 is an abundant number, since it is smaller than the sum of its proper divisors (25351626).

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

21451254 is a wasteful number, since it uses less digits than its factorization.

21451254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325035.

The product of its digits is 1600, while the sum is 24.

The square root of 21451254 is about 4631.5498485928. The cubic root of 21451254 is about 277.8545812277.

Adding to 21451254 its reverse (45215412), we get a palindrome (66666666).

The spelling of 21451254 in words is "twenty-one million, four hundred fifty-one thousand, two hundred fifty-four".