21051343291 has 8 divisors (see below), whose sum is σ = 23037550704. Its totient is φ = 19077210720.

The previous prime is 21051343279. The next prime is 21051343301. The reversal of 21051343291 is 19234315012.

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 21051343291 - 2⁷ = 21051343163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21051343091) 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, 3015060 + ... + 3022033.

It is an arithmetic number, because the mean of its divisors is an integer number (2879693838).

Almost surely, 2^21051343291 is an apocalyptic number.

21051343291 is a deficient number, since it is larger than the sum of its proper divisors (1986207413).

21051343291 is a wasteful number, since it uses less digits than its factorization.

21051343291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6037421.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 21051343291 in words is "twenty-one billion, fifty-one million, three hundred forty-three thousand, two hundred ninety-one".