21140552 has 8 divisors (see below), whose sum is σ = 39638550. Its totient is φ = 10570272.

The previous prime is 21140549. The next prime is 21140569. The reversal of 21140552 is 25504112.

It can be written as a sum of positive squares in only one way, i.e., 19307236 + 1833316 = 4394^2 + 1354^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321277 + ... + 1321292.

Almost surely, 2^21140552 is an apocalyptic number.

It is an amenable number.

21140552 is a deficient number, since it is larger than the sum of its proper divisors (18497998).

21140552 is a wasteful number, since it uses less digits than its factorization.

21140552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642575 (or 2642571 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 21140552 is about 4597.8856010127. The cubic root of 21140552 is about 276.5065611293.

Adding to 21140552 its reverse (25504112), we get a palindrome (46644664).

It can be divided in two parts, 21 and 140552, that multiplied together give a palindrome (2951592).

The spelling of 21140552 in words is "twenty-one million, one hundred forty thousand, five hundred fifty-two".