21240132124 has 12 divisors (see below), whose sum is σ = 37377887400. Its totient is φ = 10560735728.

The previous prime is 21240132113. The next prime is 21240132139. The reversal of 21240132124 is 42123104212.

It is a super-2 number, since 2×21240132124² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21240132095 and 21240132104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14831779 + ... + 14833210.

It is an arithmetic number, because the mean of its divisors is an integer number (3114823950).

Almost surely, 2^21240132124 is an apocalyptic number.

It is an amenable number.

21240132124 is a deficient number, since it is larger than the sum of its proper divisors (16137755276).

21240132124 is a wasteful number, since it uses less digits than its factorization.

21240132124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29665172 (or 29665170 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21240132124 its reverse (42123104212), we get a palindrome (63363236336).

The spelling of 21240132124 in words is "twenty-one billion, two hundred forty million, one hundred thirty-two thousand, one hundred twenty-four".