21541450 has 24 divisors (see below), whose sum is σ = 45791712. Its totient is φ = 7385520.

The previous prime is 21541447. The next prime is 21541451. The reversal of 21541450 is 5414512.

It is not an unprimeable number, because it can be changed into a prime (21541451) 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, 30424 + ... + 31123.

It is an arithmetic number, because the mean of its divisors is an integer number (1907988).

Almost surely, 2^21541450 is an apocalyptic number.

21541450 is an abundant number, since it is smaller than the sum of its proper divisors (24250262).

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

21541450 is a wasteful number, since it uses less digits than its factorization.

21541450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61566 (or 61561 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 21541450 is about 4641.2767639950. The cubic root of 21541450 is about 278.2434680262.

Adding to 21541450 its reverse (5414512), we get a palindrome (26955962).

The spelling of 21541450 in words is "twenty-one million, five hundred forty-one thousand, four hundred fifty".