21552401444340 has 48 divisors (see below), whose sum is σ = 64988779742208. Its totient is φ = 5305206509184.

The previous prime is 21552401444317. The next prime is 21552401444359. The reversal of 21552401444340 is 4344410425512.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

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, 13815641172 + ... + 13815642731.

It is an arithmetic number, because the mean of its divisors is an integer number (1353932911296).

Almost surely, 2^{21552401444340} is an apocalyptic number.

21552401444340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21552401444340 is an abundant number, since it is smaller than the sum of its proper divisors (43436378297868).

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

21552401444340 is a wasteful number, since it uses less digits than its factorization.

21552401444340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27631283928 (or 27631283926 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 39.

Adding to 21552401444340 its reverse (4344410425512), we get a palindrome (25896811869852).

The spelling of 21552401444340 in words is "twenty-one trillion, five hundred fifty-two billion, four hundred one million, four hundred forty-four thousand, three hundred forty".