21200314551 has 16 divisors (see below), whose sum is σ = 32043661440. Its totient is φ = 12359697120.

The previous prime is 21200314547. The next prime is 21200314579. The reversal of 21200314551 is 15541300212.

It is a happy number.

It is not a de Polignac number, because 21200314551 - 2² = 21200314547 is a prime.

It is a super-2 number, since 2×21200314551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200318551) 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 15 ways as a sum of consecutive naturals, for example, 14304465 + ... + 14305946.

It is an arithmetic number, because the mean of its divisors is an integer number (2002728840).

Almost surely, 2^21200314551 is an apocalyptic number.

21200314551 is a deficient number, since it is larger than the sum of its proper divisors (10843346889).

21200314551 is a wasteful number, since it uses less digits than its factorization.

21200314551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28610446.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21200314551 its reverse (15541300212), we get a palindrome (36741614763).

The spelling of 21200314551 in words is "twenty-one billion, two hundred million, three hundred fourteen thousand, five hundred fifty-one".