21010122120019 has 4 divisors (see below), whose sum is σ = 21010611145744. Its totient is φ = 21009633094296.

The previous prime is 21010122120011. The next prime is 21010122120037. The reversal of 21010122120019 is 91002122101012.

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 21010122120019 - 2³ = 21010122120011 is a prime.

It is a super-2 number, since 2×21010122120019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010122120011) 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, 244448412 + ... + 244534345.

It is an arithmetic number, because the mean of its divisors is an integer number (5252652786436).

Almost surely, 2^{21010122120019} is an apocalyptic number.

21010122120019 is a deficient number, since it is larger than the sum of its proper divisors (489025725).

21010122120019 is an equidigital number, since it uses as much as digits as its factorization.

21010122120019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489025724.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21010122120019 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, one hundred twenty thousand, nineteen".