21461552 has 20 divisors (see below), whose sum is σ = 47522256. Its totient is φ = 9197760.

The previous prime is 21461551. The next prime is 21461581. The reversal of 21461552 is 25516412.

It is not an unprimeable number, because it can be changed into a prime (21461551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95699 + ... + 95922.

Almost surely, 2^21461552 is an apocalyptic number.

It is an amenable number.

21461552 is an abundant number, since it is smaller than the sum of its proper divisors (26060704).

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

21461552 is a wasteful number, since it uses less digits than its factorization.

21461552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191636 (or 191630 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 21461552 is about 4632.6614380937. The cubic root of 21461552 is about 277.8990368839.

Adding to 21461552 its reverse (25516412), we get a palindrome (46977964).

The spelling of 21461552 in words is "twenty-one million, four hundred sixty-one thousand, five hundred fifty-two".