21240120032 has 48 divisors (see below), whose sum is σ = 42221369232. Its totient is φ = 10517391360.

The previous prime is 21240120019. The next prime is 21240120037. The reversal of 21240120032 is 23002104212.

It is a super-2 number, since 2×21240120032² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240120037) 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, 8608463 + ... + 8610929.

It is an arithmetic number, because the mean of its divisors is an integer number (879611859).

Almost surely, 2^21240120032 is an apocalyptic number.

It is an amenable number.

21240120032 is a deficient number, since it is larger than the sum of its proper divisors (20981249200).

21240120032 is a wasteful number, since it uses less digits than its factorization.

21240120032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4971 (or 4963 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21240120032 its reverse (23002104212), we get a palindrome (44242224244).

The spelling of 21240120032 in words is "twenty-one billion, two hundred forty million, one hundred twenty thousand, thirty-two".