21031005067151 has 4 divisors (see below), whose sum is σ = 21056621395704. Its totient is φ = 21005388738600.

The previous prime is 21031005067147. The next prime is 21031005067181. The reversal of 21031005067151 is 15176050013012.

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 21031005067151 - 2² = 21031005067147 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 (21031005067181) 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, 12808163045 + ... + 12808164686.

It is an arithmetic number, because the mean of its divisors is an integer number (5264155348926).

Almost surely, 2^{21031005067151} is an apocalyptic number.

21031005067151 is a deficient number, since it is larger than the sum of its proper divisors (25616328553).

21031005067151 is an equidigital number, since it uses as much as digits as its factorization.

21031005067151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25616328552.

The product of its (nonzero) digits is 6300, while the sum is 32.

The spelling of 21031005067151 in words is "twenty-one trillion, thirty-one billion, five million, sixty-seven thousand, one hundred fifty-one".