21402340550 has 48 divisors (see below), whose sum is σ = 40939641600. Its totient is φ = 8319659040.

The previous prime is 21402340529. The next prime is 21402340559. The reversal of 21402340550 is 5504320412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402340559) 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, 402839 + ... + 452861.

It is an arithmetic number, because the mean of its divisors is an integer number (852909200).

Almost surely, 2^21402340550 is an apocalyptic number.

21402340550 is a deficient number, since it is larger than the sum of its proper divisors (19537301050).

21402340550 is a wasteful number, since it uses less digits than its factorization.

21402340550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50277 (or 50272 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21402340550 its reverse (5504320412), we get a palindrome (26906660962).

The spelling of 21402340550 in words is "twenty-one billion, four hundred two million, three hundred forty thousand, five hundred fifty".