21053767151 has 4 divisors (see below), whose sum is σ = 21061530192. Its totient is φ = 21046004112.

The previous prime is 21053767129. The next prime is 21053767213. The reversal of 21053767151 is 15176735012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21053767151 is a prime.

It is a super-2 number, since 2×21053767151² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053767051) 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, 3877451 + ... + 3882876.

It is an arithmetic number, because the mean of its divisors is an integer number (5265382548).

Almost surely, 2^21053767151 is an apocalyptic number.

21053767151 is a deficient number, since it is larger than the sum of its proper divisors (7763041).

21053767151 is an equidigital number, since it uses as much as digits as its factorization.

21053767151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7763040.

The product of its (nonzero) digits is 44100, while the sum is 38.

The spelling of 21053767151 in words is "twenty-one billion, fifty-three million, seven hundred sixty-seven thousand, one hundred fifty-one".