21682650 has 96 divisors (see below), whose sum is σ = 62192448. Its totient is φ = 4940800.

The previous prime is 21682643. The next prime is 21682657. The reversal of 21682650 is 5628612.

It is an interprime number because it is at equal distance from previous prime (21682643) and next prime (21682657).

It is a super-2 number, since 2×21682650² = 940274622045000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21682657) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27664 + ... + 28436.

It is an arithmetic number, because the mean of its divisors is an integer number (647838).

Almost surely, 2^21682650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21682650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31096224).

21682650 is an abundant number, since it is smaller than the sum of its proper divisors (40509798).

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

21682650 is a wasteful number, since it uses less digits than its factorization.

21682650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 21682650 is about 4656.4632501503. The cubic root of 21682650 is about 278.8500883984.

The spelling of 21682650 in words is "twenty-one million, six hundred eighty-two thousand, six hundred fifty".