21423666411 has 24 divisors (see below), whose sum is σ = 36903709440. Its totient is φ = 11709829296.

The previous prime is 21423666361. The next prime is 21423666431. The reversal of 21423666411 is 11466632412.

It is not a de Polignac number, because 21423666411 - 2⁶ = 21423666347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21423666431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7391121 + ... + 7394018.

It is an arithmetic number, because the mean of its divisors is an integer number (1537654560).

Almost surely, 2^21423666411 is an apocalyptic number.

21423666411 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21423666411 is a deficient number, since it is larger than the sum of its proper divisors (15480043029).

21423666411 is a wasteful number, since it uses less digits than its factorization.

21423666411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14785175 (or 14785172 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 21423666411 in words is "twenty-one billion, four hundred twenty-three million, six hundred sixty-six thousand, four hundred eleven".