21235102144 has 28 divisors (see below), whose sum is σ = 42350182000. Its totient is φ = 10564190208.

The previous prime is 21235102139. The next prime is 21235102157. The reversal of 21235102144 is 44120153212.

It is a super-2 number, since 2×21235102144² (a number of 21 digits) contains 22 as substring.

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, 820929 + ... + 846400.

It is an arithmetic number, because the mean of its divisors is an integer number (1512506500).

Almost surely, 2^21235102144 is an apocalyptic number.

It is an amenable number.

21235102144 is a deficient number, since it is larger than the sum of its proper divisors (21115079856).

21235102144 is a wasteful number, since it uses less digits than its factorization.

21235102144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667540 (or 1667530 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21235102144 its reverse (44120153212), we get a palindrome (65355255356).

The spelling of 21235102144 in words is "twenty-one billion, two hundred thirty-five million, one hundred two thousand, one hundred forty-four".