21620614067533 has 4 divisors (see below), whose sum is σ = 23283738226588. Its totient is φ = 19957489908480.

The previous prime is 21620614067527. The next prime is 21620614067537. The reversal of 21620614067533 is 33576041602612.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14393995899364 + 7226618168169 = 3793942^2 + 2688237^2 .

It is a cyclic number.

It is not a de Polignac number, because 21620614067533 - 2¹⁷ = 21620613936461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620614067537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831562079508 + ... + 831562079533.

It is an arithmetic number, because the mean of its divisors is an integer number (5820934556647).

Almost surely, 2^{21620614067533} is an apocalyptic number.

It is an amenable number.

21620614067533 is a deficient number, since it is larger than the sum of its proper divisors (1663124159055).

21620614067533 is a wasteful number, since it uses less digits than its factorization.

21620614067533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663124159054.

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 21620614067533 in words is "twenty-one trillion, six hundred twenty billion, six hundred fourteen million, sixty-seven thousand, five hundred thirty-three".