21150649052 has 12 divisors (see below), whose sum is σ = 39860838696. Its totient is φ = 9761838000.

The previous prime is 21150649033. The next prime is 21150649057. The reversal of 21150649052 is 25094605112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150649057) 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 in 3 ways as a sum of consecutive naturals, for example, 203371574 + ... + 203371677.

It is an arithmetic number, because the mean of its divisors is an integer number (3321736558).

Almost surely, 2^21150649052 is an apocalyptic number.

It is an amenable number.

21150649052 is a deficient number, since it is larger than the sum of its proper divisors (18710189644).

21150649052 is a wasteful number, since it uses less digits than its factorization.

21150649052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406743268 (or 406743266 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 21150649052 in words is "twenty-one billion, one hundred fifty million, six hundred forty-nine thousand, fifty-two".