21616051565426 has 8 divisors (see below), whose sum is σ = 32428074916224. Its totient is φ = 10806693260020.

The previous prime is 21616051565417. The next prime is 21616051565431. The reversal of 21616051565426 is 62456515061612.

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

It is a super-2 number, since 2×21616051565426² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666241070 + ... + 666273513.

It is an arithmetic number, because the mean of its divisors is an integer number (4053509364528).

Almost surely, 2^{21616051565426} is an apocalyptic number.

21616051565426 is a deficient number, since it is larger than the sum of its proper divisors (10812023350798).

21616051565426 is a wasteful number, since it uses less digits than its factorization.

21616051565426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332522696.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 21616051565426 in words is "twenty-one trillion, six hundred sixteen billion, fifty-one million, five hundred sixty-five thousand, four hundred twenty-six".