21021011219 has 8 divisors (see below), whose sum is σ = 22652819952. Its totient is φ = 19391317920.

The previous prime is 21021011213. The next prime is 21021011239. The reversal of 21021011219 is 91211012012.

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

It is not a de Polignac number, because 21021011219 - 2²⁴ = 21004234003 is a prime.

It is a super-2 number, since 2×21021011219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21021011219.

It is not an unprimeable number, because it can be changed into a prime (21021011213) 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, 508184 + ... + 547989.

It is an arithmetic number, because the mean of its divisors is an integer number (2831602494).

Almost surely, 2^21021011219 is an apocalyptic number.

21021011219 is a deficient number, since it is larger than the sum of its proper divisors (1631808733).

21021011219 is a wasteful number, since it uses less digits than its factorization.

21021011219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057717.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 21021011219 in words is "twenty-one billion, twenty-one million, eleven thousand, two hundred nineteen".