21124542534 has 16 divisors (see below), whose sum is σ = 43390952688. Its totient is φ = 6851202912.

The previous prime is 21124542511. The next prime is 21124542541. The reversal of 21124542534 is 43524542112.

It is a junction number, because it is equal to n+sod(n) for n = 21124542495 and 21124542504.

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, 47577577 + ... + 47578020.

It is an arithmetic number, because the mean of its divisors is an integer number (2711934543).

Almost surely, 2^21124542534 is an apocalyptic number.

21124542534 is an abundant number, since it is smaller than the sum of its proper divisors (22266410154).

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

21124542534 is a wasteful number, since it uses less digits than its factorization.

21124542534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95155639.

The product of its digits is 38400, while the sum is 33.

The spelling of 21124542534 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-two thousand, five hundred thirty-four".