21450453060 has 48 divisors (see below), whose sum is σ = 60067982016. Its totient is φ = 5719481472.

The previous prime is 21450453029. The next prime is 21450453061. The reversal of 21450453060 is 6035405412.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21450453061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 798162 + ... + 824598.

It is an arithmetic number, because the mean of its divisors is an integer number (1251416292).

Almost surely, 2^21450453060 is an apocalyptic number.

21450453060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21450453060 is an abundant number, since it is smaller than the sum of its proper divisors (38617528956).

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

21450453060 is a wasteful number, since it uses less digits than its factorization.

21450453060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39972 (or 39970 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21450453060 its reverse (6035405412), we get a palindrome (27485858472).

The spelling of 21450453060 in words is "twenty-one billion, four hundred fifty million, four hundred fifty-three thousand, sixty".