21343633290 has 96 divisors (see below), whose sum is σ = 63459991296. Its totient is φ = 4875552000.

The previous prime is 21343633277. The next prime is 21343633303. The reversal of 21343633290 is 9233634312.

21343633290 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 363 + 3 + 290 = 666.

It is an interprime number because it is at equal distance from previous prime (21343633277) and next prime (21343633303).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1113790 + ... + 1132790.

It is an arithmetic number, because the mean of its divisors is an integer number (661041576).

Almost surely, 2^21343633290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21343633290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31729995648).

21343633290 is an abundant number, since it is smaller than the sum of its proper divisors (42116358006).

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

21343633290 is a wasteful number, since it uses less digits than its factorization.

21343633290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20804 (or 20801 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 36.

The spelling of 21343633290 in words is "twenty-one billion, three hundred forty-three million, six hundred thirty-three thousand, two hundred ninety".