21130652551 has 4 divisors (see below), whose sum is σ = 21131144632. Its totient is φ = 21130160472.

The previous prime is 21130652513. The next prime is 21130652561. The reversal of 21130652551 is 15525603112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21130652551 - 2¹⁷ = 21130521479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130652561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174741 + ... + 269806.

It is an arithmetic number, because the mean of its divisors is an integer number (5282786158).

Almost surely, 2^21130652551 is an apocalyptic number.

21130652551 is a deficient number, since it is larger than the sum of its proper divisors (492081).

21130652551 is an equidigital number, since it uses as much as digits as its factorization.

21130652551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492080.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 21130652551 in words is "twenty-one billion, one hundred thirty million, six hundred fifty-two thousand, five hundred fifty-one".