21200551452550 has 12 divisors (see below), whose sum is σ = 39433025701836. Its totient is φ = 8480220581000.

The previous prime is 21200551452541. The next prime is 21200551452583. The reversal of 21200551452550 is 5525415500212.

It is a congruent number.

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, 212005514476 + ... + 212005514575.

It is an arithmetic number, because the mean of its divisors is an integer number (3286085475153).

Almost surely, 2^{21200551452550} is an apocalyptic number.

21200551452550 is a deficient number, since it is larger than the sum of its proper divisors (18232474249286).

21200551452550 is a wasteful number, since it uses less digits than its factorization.

21200551452550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424011029063 (or 424011029058 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 37.

Adding to 21200551452550 its reverse (5525415500212), we get a palindrome (26725966952762).

The spelling of 21200551452550 in words is "twenty-one trillion, two hundred billion, five hundred fifty-one million, four hundred fifty-two thousand, five hundred fifty".