21553050 has 24 divisors (see below), whose sum is σ = 53451936. Its totient is φ = 5747440.

The previous prime is 21553039. The next prime is 21553057. The reversal of 21553050 is 5035512.

It is not an unprimeable number, because it can be changed into a prime (21553057) 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, 71694 + ... + 71993.

It is an arithmetic number, because the mean of its divisors is an integer number (2227164).

Almost surely, 2^21553050 is an apocalyptic number.

21553050 is an abundant number, since it is smaller than the sum of its proper divisors (31898886).

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

21553050 is a wasteful number, since it uses less digits than its factorization.

21553050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143702 (or 143697 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 21553050 is about 4642.5262519452. The cubic root of 21553050 is about 278.2934034615.

Adding to 21553050 its reverse (5035512), we get a palindrome (26588562).

The spelling of 21553050 in words is "twenty-one million, five hundred fifty-three thousand, fifty".