21142243405532 has 24 divisors (see below), whose sum is σ = 39522017749536. Its totient is φ = 9861244187648.

The previous prime is 21142243405489. The next prime is 21142243405553. The reversal of 21142243405532 is 23550434224112.

It is a super-2 number, since 2×21142243405532² (a number of 27 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 7 ways as a sum of consecutive naturals, for example, 1375723928 + ... + 1375739295.

It is an arithmetic number, because the mean of its divisors is an integer number (1646750739564).

Almost surely, 2^{21142243405532} is an apocalyptic number.

It is an amenable number.

21142243405532 is a deficient number, since it is larger than the sum of its proper divisors (18379774344004).

21142243405532 is a wasteful number, since it uses less digits than its factorization.

21142243405532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751463357 (or 2751463355 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

Adding to 21142243405532 its reverse (23550434224112), we get a palindrome (44692677629644).

The spelling of 21142243405532 in words is "twenty-one trillion, one hundred forty-two billion, two hundred forty-three million, four hundred five thousand, five hundred thirty-two".