21235450724 has 24 divisors (see below), whose sum is σ = 37547496000. Its totient is φ = 10508119200.

The previous prime is 21235450721. The next prime is 21235450751. The reversal of 21235450724 is 42705453212.

It is not an unprimeable number, because it can be changed into a prime (21235450721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97127 + ... + 227825.

It is an arithmetic number, because the mean of its divisors is an integer number (1564479000).

Almost surely, 2^21235450724 is an apocalyptic number.

It is an amenable number.

21235450724 is a deficient number, since it is larger than the sum of its proper divisors (16312045276).

21235450724 is a wasteful number, since it uses less digits than its factorization.

21235450724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131123 (or 131121 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

The spelling of 21235450724 in words is "twenty-one billion, two hundred thirty-five million, four hundred fifty thousand, seven hundred twenty-four".