21213044019 has 16 divisors (see below), whose sum is σ = 33080771200. Its totient is φ = 13397711688.

The previous prime is 21213044009. The next prime is 21213044029. The reversal of 21213044019 is 91044031212.

It is a happy number.

21213044019 is a `hidden beast` number, since 2 + 1 + 213 + 0 + 440 + 1 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (21213044009) and next prime (21213044029).

It is not a de Polignac number, because 21213044019 - 2⁵ = 21213043987 is a prime.

It is a super-2 number, since 2×21213044019² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213043983 and 21213044001.

It is not an unprimeable number, because it can be changed into a prime (21213044009) 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, 20674969 + ... + 20675994.

It is an arithmetic number, because the mean of its divisors is an integer number (2067548200).

Almost surely, 2^21213044019 is an apocalyptic number.

21213044019 is a deficient number, since it is larger than the sum of its proper divisors (11867727181).

21213044019 is a wasteful number, since it uses less digits than its factorization.

21213044019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41350991 (or 41350985 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21213044019 in words is "twenty-one billion, two hundred thirteen million, forty-four thousand, nineteen".