21225102640066 has 48 divisors (see below), whose sum is σ = 35100354088800. Its totient is φ = 9618919100544.

The previous prime is 21225102640057. The next prime is 21225102640177. The reversal of 21225102640066 is 66004620152212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16469325 + ... + 17711263.

It is an arithmetic number, because the mean of its divisors is an integer number (731257376850).

Almost surely, 2^{21225102640066} is an apocalyptic number.

21225102640066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21225102640066 is a deficient number, since it is larger than the sum of its proper divisors (13875251448734).

21225102640066 is a wasteful number, since it uses less digits than its factorization.

21225102640066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242883 (or 1242870 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21225102640066 its reverse (66004620152212), we get a palindrome (87229722792278).

The spelling of 21225102640066 in words is "twenty-one trillion, two hundred twenty-five billion, one hundred two million, six hundred forty thousand, sixty-six".