21436663412 has 48 divisors (see below), whose sum is σ = 39503528064. Its totient is φ = 10158720000.

The previous prime is 21436663411. The next prime is 21436663421.

21436663412 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436663411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14473712 + ... + 14475192.

It is an arithmetic number, because the mean of its divisors is an integer number (822990168).

Almost surely, 2^21436663412 is an apocalyptic number.

It is an amenable number.

21436663412 is a deficient number, since it is larger than the sum of its proper divisors (18066864652).

21436663412 is a wasteful number, since it uses less digits than its factorization.

21436663412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840 (or 2838 counting only the distinct ones).

The product of its digits is 124416, while the sum is 38.

The spelling of 21436663412 in words is "twenty-one billion, four hundred thirty-six million, six hundred sixty-three thousand, four hundred twelve".