21036134551 has 8 divisors (see below), whose sum is σ = 21127163904. Its totient is φ = 20945163000.

The previous prime is 21036134531. The next prime is 21036134569. The reversal of 21036134551 is 15543163012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21036134551 - 2¹³ = 21036126359 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 (21036134501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 817386 + ... + 842728.

It is an arithmetic number, because the mean of its divisors is an integer number (2640895488).

Almost surely, 2^21036134551 is an apocalyptic number.

21036134551 is a deficient number, since it is larger than the sum of its proper divisors (91029353).

21036134551 is a wasteful number, since it uses less digits than its factorization.

21036134551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28901.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 21036134551 its reverse (15543163012), we get a palindrome (36579297563).

The spelling of 21036134551 in words is "twenty-one billion, thirty-six million, one hundred thirty-four thousand, five hundred fifty-one".