21434021050 has 48 divisors (see below), whose sum is σ = 43020684000. Its totient is φ = 7898120640.

The previous prime is 21434021029. The next prime is 21434021051. The reversal of 21434021050 is 5012043412.

It is not an unprimeable number, because it can be changed into a prime (21434021051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 291309 + ... + 357391.

It is an arithmetic number, because the mean of its divisors is an integer number (896264250).

Almost surely, 2^21434021050 is an apocalyptic number.

21434021050 is an abundant number, since it is smaller than the sum of its proper divisors (21586662950).

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

21434021050 is a wasteful number, since it uses less digits than its factorization.

21434021050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66607 (or 66602 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21434021050 its reverse (5012043412), we get a palindrome (26446064462).

The spelling of 21434021050 in words is "twenty-one billion, four hundred thirty-four million, twenty-one thousand, fifty".