21225030164 has 24 divisors (see below), whose sum is σ = 40005050400. Its totient is φ = 9795180384.

The previous prime is 21225030143. The next prime is 21225030181. The reversal of 21225030164 is 46103052212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 856127 + ... + 880569.

It is an arithmetic number, because the mean of its divisors is an integer number (1666877100).

Almost surely, 2^21225030164 is an apocalyptic number.

It is an amenable number.

21225030164 is a deficient number, since it is larger than the sum of its proper divisors (18780020236).

21225030164 is a wasteful number, since it uses less digits than its factorization.

21225030164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41159 (or 41157 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21225030164 its reverse (46103052212), we get a palindrome (67328082376).

The spelling of 21225030164 in words is "twenty-one billion, two hundred twenty-five million, thirty thousand, one hundred sixty-four".