21053153450 has 48 divisors (see below), whose sum is σ = 44775467520. Its totient is φ = 7214598720.

The previous prime is 21053153437. The next prime is 21053153453. The reversal of 21053153450 is 5435135012.

It is not an unprimeable number, because it can be changed into a prime (21053153453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 736016 + ... + 764084.

It is an arithmetic number, because the mean of its divisors is an integer number (932822240).

Almost surely, 2^21053153450 is an apocalyptic number.

21053153450 is an abundant number, since it is smaller than the sum of its proper divisors (23722314070).

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

21053153450 is a wasteful number, since it uses less digits than its factorization.

21053153450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30231 (or 30226 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 21053153450 its reverse (5435135012), we get a palindrome (26488288462).

The spelling of 21053153450 in words is "twenty-one billion, fifty-three million, one hundred fifty-three thousand, four hundred fifty".