21101254 has 4 divisors (see below), whose sum is σ = 31651884. Its totient is φ = 10550626.

The previous prime is 21101251. The next prime is 21101257. The reversal of 21101254 is 45210112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21101251) and next prime (21101257).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275312 + ... + 5275315.

It is an arithmetic number, because the mean of its divisors is an integer number (7912971).

Almost surely, 2^21101254 is an apocalyptic number.

21101254 is a deficient number, since it is larger than the sum of its proper divisors (10550630).

21101254 is a wasteful number, since it uses less digits than its factorization.

21101254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550629.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21101254 is about 4593.6101271222. The cubic root of 21101254 is about 276.3351229252.

Adding to 21101254 its reverse (45210112), we get a palindrome (66311366).

It can be divided in two parts, 2110 and 1254, that added together give a square (3364 = 58²).

The spelling of 21101254 in words is "twenty-one million, one hundred one thousand, two hundred fifty-four".