21634635306 has 16 divisors (see below), whose sum is σ = 44002648800. Its totient is φ = 7089315408.

The previous prime is 21634635299. The next prime is 21634635313. The reversal of 21634635306 is 60353643612.

It is an interprime number because it is at equal distance from previous prime (21634635299) and next prime (21634635313).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30557041 + ... + 30557748.

It is an arithmetic number, because the mean of its divisors is an integer number (2750165550).

Almost surely, 2^21634635306 is an apocalyptic number.

21634635306 is an abundant number, since it is smaller than the sum of its proper divisors (22368013494).

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

21634635306 is a wasteful number, since it uses less digits than its factorization.

21634635306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61114853.

The product of its (nonzero) digits is 233280, while the sum is 39.

The spelling of 21634635306 in words is "twenty-one billion, six hundred thirty-four million, six hundred thirty-five thousand, three hundred six".