21121504552342 has 4 divisors (see below), whose sum is σ = 31682256828516. Its totient is φ = 10560752276170.

The previous prime is 21121504552339. The next prime is 21121504552361. The reversal of 21121504552342 is 24325540512112.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21121504552342² (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 as a sum of consecutive naturals, namely, 5280376138084 + ... + 5280376138087.

It is an arithmetic number, because the mean of its divisors is an integer number (7920564207129).

Almost surely, 2^{21121504552342} is an apocalyptic number.

21121504552342 is a deficient number, since it is larger than the sum of its proper divisors (10560752276174).

21121504552342 is a wasteful number, since it uses less digits than its factorization.

21121504552342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560752276173.

The product of its (nonzero) digits is 96000, while the sum is 37.

The spelling of 21121504552342 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred four million, five hundred fifty-two thousand, three hundred forty-two".