21451054 has 4 divisors (see below), whose sum is σ = 32176584. Its totient is φ = 10725526.

The previous prime is 21451033. The next prime is 21451063. The reversal of 21451054 is 45015412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362762 + ... + 5362765.

It is an arithmetic number, because the mean of its divisors is an integer number (8044146).

Almost surely, 2^21451054 is an apocalyptic number.

21451054 is a deficient number, since it is larger than the sum of its proper divisors (10725530).

21451054 is a wasteful number, since it uses less digits than its factorization.

21451054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10725529.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 21451054 is about 4631.5282574977. The cubic root of 21451054 is about 277.8537177026.

Adding to 21451054 its reverse (45015412), we get a palindrome (66466466).

The spelling of 21451054 in words is "twenty-one million, four hundred fifty-one thousand, fifty-four".