21121320219 has 8 divisors (see below), whose sum is σ = 28282627152. Its totient is φ = 14020446720.

The previous prime is 21121320203. The next prime is 21121320257. The reversal of 21121320219 is 91202312112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121320219 - 2⁴ = 21121320203 is a prime.

It is a super-2 number, since 2×21121320219² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121320289) 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, 15107542 + ... + 15108939.

It is an arithmetic number, because the mean of its divisors is an integer number (3535328394).

Almost surely, 2^21121320219 is an apocalyptic number.

21121320219 is a deficient number, since it is larger than the sum of its proper divisors (7161306933).

21121320219 is a wasteful number, since it uses less digits than its factorization.

21121320219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30216717.

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 21121320219 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty thousand, two hundred nineteen".