21270226666 has 16 divisors (see below), whose sum is σ = 36167997600. Its totient is φ = 9300341808.

The previous prime is 21270226661. The next prime is 21270226669. The reversal of 21270226666 is 66662207212.

It is not an unprimeable number, because it can be changed into a prime (21270226661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21528076 + ... + 21529063.

It is an arithmetic number, because the mean of its divisors is an integer number (2260499850).

Almost surely, 2^21270226666 is an apocalyptic number.

21270226666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21270226666 is a deficient number, since it is larger than the sum of its proper divisors (14897770934).

21270226666 is a wasteful number, since it uses less digits than its factorization.

21270226666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43057173.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 21270226666 in words is "twenty-one billion, two hundred seventy million, two hundred twenty-six thousand, six hundred sixty-six".