21616106425431 has 8 divisors (see below), whose sum is σ = 32938828838784. Its totient is φ = 12352060814520.

The previous prime is 21616106425409. The next prime is 21616106425439. The reversal of 21616106425431 is 13452460161612.

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

It is not a de Polignac number, because 21616106425431 - 2²⁷ = 21615972207703 is a prime.

It is a super-2 number, since 2×21616106425431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616106425439) 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, 514669200585 + ... + 514669200626.

It is an arithmetic number, because the mean of its divisors is an integer number (4117353604848).

Almost surely, 2^{21616106425431} is an apocalyptic number.

21616106425431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21616106425431 is a deficient number, since it is larger than the sum of its proper divisors (11322722413353).

21616106425431 is a wasteful number, since it uses less digits than its factorization.

21616106425431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029338401221.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21616106425431 in words is "twenty-one trillion, six hundred sixteen billion, one hundred six million, four hundred twenty-five thousand, four hundred thirty-one".