21663411334435 has 16 divisors (see below), whose sum is σ = 27995914003680. Its totient is φ = 15997526979840.

The previous prime is 21663411334427. The next prime is 21663411334483. The reversal of 21663411334435 is 53443311436612.

It is a happy number.

It is not a de Polignac number, because 21663411334435 - 2³ = 21663411334427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18276111 + ... + 19425319.

It is an arithmetic number, because the mean of its divisors is an integer number (1749744625230).

Almost surely, 2^{21663411334435} is an apocalyptic number.

21663411334435 is a deficient number, since it is larger than the sum of its proper divisors (6332502669245).

21663411334435 is a wasteful number, since it uses less digits than its factorization.

21663411334435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439238.

The product of its digits is 1866240, while the sum is 46.

The spelling of 21663411334435 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, three hundred thirty-four thousand, four hundred thirty-five".