21144302124 has 48 divisors (see below), whose sum is σ = 54470344320. Its totient is φ = 6330163840.

The previous prime is 21144302119. The next prime is 21144302159. The reversal of 21144302124 is 42120344112.

It is a super-2 number, since 2×21144302124² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21144302094 and 21144302103.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 954009 + ... + 975920.

It is an arithmetic number, because the mean of its divisors is an integer number (1134798840).

Almost surely, 2^21144302124 is an apocalyptic number.

It is an amenable number.

21144302124 is an abundant number, since it is smaller than the sum of its proper divisors (33326042196).

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

21144302124 is a wasteful number, since it uses less digits than its factorization.

21144302124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930030 (or 1930028 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21144302124 its reverse (42120344112), we get a palindrome (63264646236).

The spelling of 21144302124 in words is "twenty-one billion, one hundred forty-four million, three hundred two thousand, one hundred twenty-four".