21437411550 has 48 divisors (see below), whose sum is σ = 53176096512. Its totient is φ = 5715426400.

The previous prime is 21437411543. The next prime is 21437411551. The reversal of 21437411550 is 5511473412.

It is a super-2 number, since 2×21437411550² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437411551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 858745 + ... + 883355.

It is an arithmetic number, because the mean of its divisors is an integer number (1107835344).

Almost surely, 2^21437411550 is an apocalyptic number.

21437411550 is an abundant number, since it is smaller than the sum of its proper divisors (31738684962).

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

21437411550 is a wasteful number, since it uses less digits than its factorization.

21437411550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30433 (or 30428 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

Adding to 21437411550 its reverse (5511473412), we get a palindrome (26948884962).

The spelling of 21437411550 in words is "twenty-one billion, four hundred thirty-seven million, four hundred eleven thousand, five hundred fifty".