21424950 has 72 divisors (see below), whose sum is σ = 58844448. Its totient is φ = 5586240.

The previous prime is 21424943. The next prime is 21424957. The reversal of 21424950 is 5942412.

It is an interprime number because it is at equal distance from previous prime (21424943) and next prime (21424957).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424957) 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, 20644 + ... + 21656.

It is an arithmetic number, because the mean of its divisors is an integer number (817284).

Almost surely, 2^21424950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21424950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29422224).

21424950 is an abundant number, since it is smaller than the sum of its proper divisors (37419498).

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

21424950 is a wasteful number, since it uses less digits than its factorization.

21424950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21424950 is about 4628.7093233427. The cubic root of 21424950 is about 277.7409643066.

The spelling of 21424950 in words is "twenty-one million, four hundred twenty-four thousand, nine hundred fifty".