21052068919 has 16 divisors (see below), whose sum is σ = 24894097920. Its totient is φ = 17418935520.

The previous prime is 21052068901. The next prime is 21052068929. The reversal of 21052068919 is 91986025012.

It is not a de Polignac number, because 21052068919 - 2⁹ = 21052068407 is a prime.

It is a super-2 number, since 2×21052068919² (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 (21052068929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1752604 + ... + 1764574.

It is an arithmetic number, because the mean of its divisors is an integer number (1555881120).

Almost surely, 2^21052068919 is an apocalyptic number.

21052068919 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21052068919 is a deficient number, since it is larger than the sum of its proper divisors (3842029001).

21052068919 is a wasteful number, since it uses less digits than its factorization.

21052068919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20670.

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 21052068919 in words is "twenty-one billion, fifty-two million, sixty-eight thousand, nine hundred nineteen".