21629016 has 96 divisors (see below), whose sum is σ = 62955360. Its totient is φ = 6690816.

The previous prime is 21629009. The next prime is 21629021. The reversal of 21629016 is 61092612.

21629016 is a `hidden beast` number, since 21 + 629 + 0 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61096 + ... + 61448.

It is an arithmetic number, because the mean of its divisors is an integer number (655785).

Almost surely, 2^21629016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21629016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31477680).

21629016 is an abundant number, since it is smaller than the sum of its proper divisors (41326344).

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

21629016 is a wasteful number, since it uses less digits than its factorization.

21629016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21629016 is about 4650.7005923839. The cubic root of 21629016 is about 278.6199782387.

The spelling of 21629016 in words is "twenty-one million, six hundred twenty-nine thousand, sixteen".