21225030166 has 16 divisors (see below), whose sum is σ = 32396864400. Its totient is φ = 10426294368.

The previous prime is 21225030143. The next prime is 21225030181. The reversal of 21225030166 is 66103052212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143056 + ... + 250828.

It is an arithmetic number, because the mean of its divisors is an integer number (2024804025).

Almost surely, 2^21225030166 is an apocalyptic number.

21225030166 is a deficient number, since it is larger than the sum of its proper divisors (11171834234).

21225030166 is a wasteful number, since it uses less digits than its factorization.

21225030166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109503.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21225030166 its reverse (66103052212), we get a palindrome (87328082378).

The spelling of 21225030166 in words is "twenty-one billion, two hundred twenty-five million, thirty thousand, one hundred sixty-six".