21147663292 has 24 divisors (see below), whose sum is σ = 42804913536. Its totient is φ = 8954087088.

The previous prime is 21147663287. The next prime is 21147663293. The reversal of 21147663292 is 29236674112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147663293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4547518 + ... + 4552165.

It is an arithmetic number, because the mean of its divisors is an integer number (1783538064).

Almost surely, 2^21147663292 is an apocalyptic number.

It is an amenable number.

21147663292 is an abundant number, since it is smaller than the sum of its proper divisors (21657250244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21147663292 is a wasteful number, since it uses less digits than its factorization.

21147663292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9099777 (or 9099775 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The spelling of 21147663292 in words is "twenty-one billion, one hundred forty-seven million, six hundred sixty-three thousand, two hundred ninety-two".