21550434311440 has 40 divisors (see below), whose sum is σ = 50105979683928. Its totient is φ = 8619963847680.

The previous prime is 21550434311411. The next prime is 21550434311507. The reversal of 21550434311440 is 4411343405512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7551701857296 + 13998732454144 = 2748036^2 + 3741488^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 21550434311440.

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, 47980 + ... + 6565300.

Almost surely, 2^{21550434311440} is an apocalyptic number.

21550434311440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21550434311440 is an abundant number, since it is smaller than the sum of its proper divisors (28555545372488).

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

21550434311440 is a wasteful number, since it uses less digits than its factorization.

21550434311440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6558667 (or 6558661 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 21550434311440 its reverse (4411343405512), we get a palindrome (25961777716952).

The spelling of 21550434311440 in words is "twenty-one trillion, five hundred fifty billion, four hundred thirty-four million, three hundred eleven thousand, four hundred forty".