21111152124 has 24 divisors (see below), whose sum is σ = 49266891520. Its totient is φ = 7035974064.

The previous prime is 21111152107. The next prime is 21111152147. The reversal of 21111152124 is 42125111112.

It is a super-2 number, since 2×21111152124² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21111152124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50794 + ... + 211665.

Almost surely, 2^21111152124 is an apocalyptic number.

It is an amenable number.

21111152124 is an abundant number, since it is smaller than the sum of its proper divisors (28155739396).

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

21111152124 is a wasteful number, since it uses less digits than its factorization.

21111152124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269169 (or 269167 counting only the distinct ones).

The product of its digits is 160, while the sum is 21.

Adding to 21111152124 its reverse (42125111112), we get a palindrome (63236263236).

The spelling of 21111152124 in words is "twenty-one billion, one hundred eleven million, one hundred fifty-two thousand, one hundred twenty-four".