21451030 has 8 divisors (see below), whose sum is σ = 38611872. Its totient is φ = 8580408.

The previous prime is 21451013. The next prime is 21451033. The reversal of 21451030 is 3015412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21450995 and 21451013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072542 + ... + 1072561.

It is an arithmetic number, because the mean of its divisors is an integer number (4826484).

Almost surely, 2^21451030 is an apocalyptic number.

21451030 is a deficient number, since it is larger than the sum of its proper divisors (17160842).

21451030 is a wasteful number, since it uses less digits than its factorization.

21451030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145110.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21451030 is about 4631.5256665596. The cubic root of 21451030 is about 277.8536140792.

Adding to 21451030 its reverse (3015412), we get a palindrome (24466442).

The spelling of 21451030 in words is "twenty-one million, four hundred fifty-one thousand, thirty".