21342542651 has 8 divisors (see below), whose sum is σ = 22387083264. Its totient is φ = 20307719080.

The previous prime is 21342542569. The next prime is 21342542687. The reversal of 21342542651 is 15624524312.

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 21342542651 - 2³⁴ = 4162673467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21342592651) 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, 2424761 + ... + 2433546.

It is an arithmetic number, because the mean of its divisors is an integer number (2798385408).

Almost surely, 2^21342542651 is an apocalyptic number.

21342542651 is a deficient number, since it is larger than the sum of its proper divisors (1044540613).

21342542651 is a wasteful number, since it uses less digits than its factorization.

21342542651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4858521.

The product of its digits is 57600, while the sum is 35.

The spelling of 21342542651 in words is "twenty-one billion, three hundred forty-two million, five hundred forty-two thousand, six hundred fifty-one".