21369049712 has 20 divisors (see below), whose sum is σ = 41441959896. Its totient is φ = 10674350400.

The previous prime is 21369049699. The next prime is 21369049717. The reversal of 21369049712 is 21794096312.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369049717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618563 + ... + 652194.

Almost surely, 2^21369049712 is an apocalyptic number.

It is an amenable number.

21369049712 is a deficient number, since it is larger than the sum of its proper divisors (20072910184).

21369049712 is a wasteful number, since it uses less digits than its factorization.

21369049712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271816 (or 1271810 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 21369049712 in words is "twenty-one billion, three hundred sixty-nine million, forty-nine thousand, seven hundred twelve".