21421846966 has 16 divisors (see below), whose sum is σ = 35340790464. Its totient is φ = 9676643904.

The previous prime is 21421846961. The next prime is 21421847003. The reversal of 21421846966 is 66964812412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421846961) 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, 8763855 + ... + 8766298.

It is an arithmetic number, because the mean of its divisors is an integer number (2208799404).

Almost surely, 2^21421846966 is an apocalyptic number.

21421846966 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21421846966 is a deficient number, since it is larger than the sum of its proper divisors (13918943498).

21421846966 is a wasteful number, since it uses less digits than its factorization.

21421846966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17530215.

The product of its digits is 995328, while the sum is 49.

The spelling of 21421846966 in words is "twenty-one billion, four hundred twenty-one million, eight hundred forty-six thousand, nine hundred sixty-six".