21169038662 has 4 divisors (see below), whose sum is σ = 31753557996. Its totient is φ = 10584519330.

The previous prime is 21169038661. The next prime is 21169038739. The reversal of 21169038662 is 26683096112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21169038661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5292259664 + ... + 5292259667.

It is an arithmetic number, because the mean of its divisors is an integer number (7938389499).

Almost surely, 2^21169038662 is an apocalyptic number.

21169038662 is a deficient number, since it is larger than the sum of its proper divisors (10584519334).

21169038662 is a wasteful number, since it uses less digits than its factorization.

21169038662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10584519333.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 21169038662 in words is "twenty-one billion, one hundred sixty-nine million, thirty-eight thousand, six hundred sixty-two".