21769650 has 72 divisors (see below), whose sum is σ = 66852864. Its totient is φ = 4975200.

The previous prime is 21769603. The next prime is 21769651. The reversal of 21769650 is 5696712.

It is a super-2 number, since 2×21769650² = 947835322245000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21769651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 306 + ... + 6605.

It is an arithmetic number, because the mean of its divisors is an integer number (928512).

Almost surely, 2^21769650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21769650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33426432).

21769650 is an abundant number, since it is smaller than the sum of its proper divisors (45083214).

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

21769650 is a wasteful number, since it uses less digits than its factorization.

21769650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6936 (or 6928 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 21769650 is about 4665.7957520663. The cubic root of 21769650 is about 279.2225456817. Note that the first 3 decimals are identical.

The spelling of 21769650 in words is "twenty-one million, seven hundred sixty-nine thousand, six hundred fifty".