21623064 has 32 divisors (see below), whose sum is σ = 56904000. Its totient is φ = 6828192.

The previous prime is 21623057. The next prime is 21623081. The reversal of 21623064 is 46032612.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23254 + ... + 24165.

It is an arithmetic number, because the mean of its divisors is an integer number (1778250).

Almost surely, 2^21623064 is an apocalyptic number.

21623064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21623064 is an abundant number, since it is smaller than the sum of its proper divisors (35280936).

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

21623064 is a wasteful number, since it uses less digits than its factorization.

21623064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47447 (or 47443 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21623064 is about 4650.0606447658. The cubic root of 21623064 is about 278.5944184652.

Adding to 21623064 its reverse (46032612), we get a palindrome (67655676).

It can be divided in two parts, 216 and 23064, that multiplied together give a square (4981824 = 2232²).

The spelling of 21623064 in words is "twenty-one million, six hundred twenty-three thousand, sixty-four".