21030546 has 8 divisors (see below), whose sum is σ = 42061104. Its totient is φ = 7010180.

The previous prime is 21030469. The next prime is 21030551. The reversal of 21030546 is 64503012.

It is a happy number.

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

21030546 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1752540 + ... + 1752551.

It is an arithmetic number, because the mean of its divisors is an integer number (5257638).

Almost surely, 2^21030546 is an apocalyptic number.

21030546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21030546 is a wasteful number, since it uses less digits than its factorization.

21030546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3505096.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21030546 is about 4585.9073257099. The cubic root of 21030546 is about 276.0261212413.

Adding to 21030546 its reverse (64503012), we get a palindrome (85533558).

The spelling of 21030546 in words is "twenty-one million, thirty thousand, five hundred forty-six".