21235431050 has 24 divisors (see below), whose sum is σ = 39568110336. Its totient is φ = 8479073840.

The previous prime is 21235431043. The next prime is 21235431059. The reversal of 21235431050 is 5013453212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21235431059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 349034 + ... + 405333.

It is an arithmetic number, because the mean of its divisors is an integer number (1648671264).

Almost surely, 2^21235431050 is an apocalyptic number.

21235431050 is a deficient number, since it is larger than the sum of its proper divisors (18332679286).

21235431050 is a wasteful number, since it uses less digits than its factorization.

21235431050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754942 (or 754937 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21235431050 its reverse (5013453212), we get a palindrome (26248884262).

The spelling of 21235431050 in words is "twenty-one billion, two hundred thirty-five million, four hundred thirty-one thousand, fifty".