21434220050 has 12 divisors (see below), whose sum is σ = 39867649386. Its totient is φ = 8573688000.

The previous prime is 21434220001. The next prime is 21434220097. The reversal of 21434220050 is 5002243412.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 18885080929 + 2549139121 = 137423^2 + 50489^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21434219998 and 21434220025.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214342151 + ... + 214342250.

Almost surely, 2^21434220050 is an apocalyptic number.

21434220050 is a deficient number, since it is larger than the sum of its proper divisors (18433429336).

21434220050 is a wasteful number, since it uses less digits than its factorization.

21434220050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428684413 (or 428684408 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 21434220050 its reverse (5002243412), we get a palindrome (26436463462).

The spelling of 21434220050 in words is "twenty-one billion, four hundred thirty-four million, two hundred twenty thousand, fifty".