21354661617062 has 4 divisors (see below), whose sum is σ = 32031992425596. Its totient is φ = 10677330808530.

The previous prime is 21354661617061. The next prime is 21354661617071. The reversal of 21354661617062 is 26071616645312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21354661617062.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354661617061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338665404264 + ... + 5338665404267.

It is an arithmetic number, because the mean of its divisors is an integer number (8007998106399).

Almost surely, 2^{21354661617062} is an apocalyptic number.

21354661617062 is a deficient number, since it is larger than the sum of its proper divisors (10677330808534).

21354661617062 is a wasteful number, since it uses less digits than its factorization.

21354661617062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677330808533.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 21354661617062 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred sixty-one million, six hundred seventeen thousand, sixty-two".