21625350 has 24 divisors (see below), whose sum is σ = 53631240. Its totient is φ = 5766720.

The previous prime is 21625339. The next prime is 21625367. The reversal of 21625350 is 5352612.

It is a self number, because there is not a number n which added to its sum of digits gives 21625350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71935 + ... + 72234.

It is an arithmetic number, because the mean of its divisors is an integer number (2234635).

Almost surely, 2^21625350 is an apocalyptic number.

21625350 is an abundant number, since it is smaller than the sum of its proper divisors (32005890).

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

21625350 is a wasteful number, since it uses less digits than its factorization.

21625350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144184 (or 144179 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 21625350 is about 4650.3064415154. The cubic root of 21625350 is about 278.6042358281.

Adding to 21625350 its reverse (5352612), we get a palindrome (26977962).

It can be divided in two parts, 216 and 25350, that multiplied together give a square (5475600 = 2340²).

The spelling of 21625350 in words is "twenty-one million, six hundred twenty-five thousand, three hundred fifty".