21616222250061 has 6 divisors (see below), whose sum is σ = 31223432138990. Its totient is φ = 14410814833368.

The previous prime is 21616222250059. The next prime is 21616222250093. The reversal of 21616222250061 is 16005222261612.

21616222250061 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 622 + 2 + 25 + 0 + 0 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21472936532100 + 143285717961 = 4633890^2 + 378531^2 .

It is not a de Polignac number, because 21616222250061 - 2¹ = 21616222250059 is a prime.

It is a super-2 number, since 2×21616222250061² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21616222249998 and 21616222250025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616222200061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1200901236106 + ... + 1200901236123.

Almost surely, 2^{21616222250061} is an apocalyptic number.

It is an amenable number.

21616222250061 is a deficient number, since it is larger than the sum of its proper divisors (9607209888929).

21616222250061 is a wasteful number, since it uses less digits than its factorization.

21616222250061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401802472235 (or 2401802472232 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21616222250061 in words is "twenty-one trillion, six hundred sixteen billion, two hundred twenty-two million, two hundred fifty thousand, sixty-one".