21311051115144 has 64 divisors (see below), whose sum is σ = 61083250266240. Its totient is φ = 6069418467840.

The previous prime is 21311051115119. The next prime is 21311051115169. The reversal of 21311051115144 is 44151115011312.

It is an interprime number because it is at equal distance from previous prime (21311051115119) and next prime (21311051115169).

It is a super-2 number, since 2×21311051115144² (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 15 ways as a sum of consecutive naturals, for example, 202585587 + ... + 202690754.

It is an arithmetic number, because the mean of its divisors is an integer number (954425785410).

Almost surely, 2^{21311051115144} is an apocalyptic number.

21311051115144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21311051115144 is an abundant number, since it is smaller than the sum of its proper divisors (39772199151096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311051115144 is a wasteful number, since it uses less digits than its factorization.

21311051115144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405276670 (or 405276666 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 30.

Adding to 21311051115144 its reverse (44151115011312), we get a palindrome (65462166126456).

The spelling of 21311051115144 in words is "twenty-one trillion, three hundred eleven billion, fifty-one million, one hundred fifteen thousand, one hundred forty-four".