21616210016061 has 8 divisors (see below), whose sum is σ = 28830158169120. Its totient is φ = 14406534270192.

The previous prime is 21616210016053. The next prime is 21616210016069. The reversal of 21616210016061 is 16061001261612.

It is an interprime number because it is at equal distance from previous prime (21616210016053) and next prime (21616210016069).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21616210016061 - 2³ = 21616210016053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616210016069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1068089991 + ... + 1068110228.

It is an arithmetic number, because the mean of its divisors is an integer number (3603769771140).

Almost surely, 2^{21616210016061} is an apocalyptic number.

It is an amenable number.

21616210016061 is a deficient number, since it is larger than the sum of its proper divisors (7213948153059).

21616210016061 is a wasteful number, since it uses less digits than its factorization.

21616210016061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136203595.

The product of its (nonzero) digits is 5184, while the sum is 33.

Adding to 21616210016061 its reverse (16061001261612), we get a palindrome (37677211277673).

The spelling of 21616210016061 in words is "twenty-one trillion, six hundred sixteen billion, two hundred ten million, sixteen thousand, sixty-one".