21919450 has 24 divisors (see below), whose sum is σ = 46595232. Its totient is φ = 7515120.

The previous prime is 21919441. The next prime is 21919459. The reversal of 21919450 is 5491912.

It is an interprime number because it is at equal distance from previous prime (21919441) and next prime (21919459).

It is not an unprimeable number, because it can be changed into a prime (21919459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30964 + ... + 31663.

It is an arithmetic number, because the mean of its divisors is an integer number (1941468).

Almost surely, 2^21919450 is an apocalyptic number.

21919450 is an abundant number, since it is smaller than the sum of its proper divisors (24675782).

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

21919450 is a wasteful number, since it uses less digits than its factorization.

21919450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62646 (or 62641 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 21919450 is about 4681.8212268304. The cubic root of 21919450 is about 279.8615386844.

The spelling of 21919450 in words is "twenty-one million, nine hundred nineteen thousand, four hundred fifty".