21601216142 has 16 divisors (see below), whose sum is σ = 35431420464. Its totient is φ = 9795408000.

The previous prime is 21601216139. The next prime is 21601216157. The reversal of 21601216142 is 24161210612.

It is a super-2 number, since 2×21601216142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1156859 + ... + 1175382.

It is an arithmetic number, because the mean of its divisors is an integer number (2214463779).

Almost surely, 2^21601216142 is an apocalyptic number.

21601216142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21601216142 is a deficient number, since it is larger than the sum of its proper divisors (13830204322).

21601216142 is a wasteful number, since it uses less digits than its factorization.

21601216142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332675.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 21601216142 its reverse (24161210612), we get a palindrome (45762426754).

The spelling of 21601216142 in words is "twenty-one billion, six hundred one million, two hundred sixteen thousand, one hundred forty-two".