21145010144 has 48 divisors (see below), whose sum is σ = 41786752896. Its totient is φ = 10532592000.

The previous prime is 21145010143. The next prime is 21145010147. The reversal of 21145010144 is 44101054112.

It is a super-2 number, since 2×21145010144² (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 (21145010143) 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, 16378139 + ... + 16379429.

It is an arithmetic number, because the mean of its divisors is an integer number (870557352).

Almost surely, 2^21145010144 is an apocalyptic number.

It is an amenable number.

21145010144 is a deficient number, since it is larger than the sum of its proper divisors (20641742752).

21145010144 is a wasteful number, since it uses less digits than its factorization.

21145010144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839 (or 2831 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21145010144 its reverse (44101054112), we get a palindrome (65246064256).

The spelling of 21145010144 in words is "twenty-one billion, one hundred forty-five million, ten thousand, one hundred forty-four".