21646562034 has 8 divisors (see below), whose sum is σ = 43293124080. Its totient is φ = 7215520676.

The previous prime is 21646562027. The next prime is 21646562039. The reversal of 21646562034 is 43026564612.

It is a sphenic number, since it is the product of 3 distinct primes.

21646562034 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21646561983 and 21646562001.

It is not an unprimeable number, because it can be changed into a prime (21646562039) 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, 1803880164 + ... + 1803880175.

It is an arithmetic number, because the mean of its divisors is an integer number (5411640510).

Almost surely, 2^21646562034 is an apocalyptic number.

21646562034 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21646562034 is a wasteful number, since it uses less digits than its factorization.

21646562034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607760344.

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 21646562034 in words is "twenty-one billion, six hundred forty-six million, five hundred sixty-two thousand, thirty-four".