21552512210542 has 32 divisors (see below), whose sum is σ = 33097994164224. Its totient is φ = 10520982276000.

The previous prime is 21552512210533. The next prime is 21552512210543. The reversal of 21552512210542 is 24501221525512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552512210543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691856667 + ... + 691887817.

It is an arithmetic number, because the mean of its divisors is an integer number (1034312317632).

Almost surely, 2^{21552512210542} is an apocalyptic number.

21552512210542 is a deficient number, since it is larger than the sum of its proper divisors (11545481953682).

21552512210542 is a wasteful number, since it uses less digits than its factorization.

21552512210542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49104.

The product of its (nonzero) digits is 80000, while the sum is 37.

The spelling of 21552512210542 in words is "twenty-one trillion, five hundred fifty-two billion, five hundred twelve million, two hundred ten thousand, five hundred forty-two".