21030213019 has 4 divisors (see below), whose sum is σ = 21050454880. Its totient is φ = 21009971160.

The previous prime is 21030213013. The next prime is 21030213053. The reversal of 21030213019 is 91031203012.

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 21030213019 - 2⁷ = 21030212891 is a prime.

It is a super-2 number, since 2×21030213019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030213013) 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, 10119372 + ... + 10121449.

It is an arithmetic number, because the mean of its divisors is an integer number (5262613720).

Almost surely, 2^21030213019 is an apocalyptic number.

21030213019 is a deficient number, since it is larger than the sum of its proper divisors (20241861).

21030213019 is a wasteful number, since it uses less digits than its factorization.

21030213019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20241860.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21030213019 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, nineteen".