21212020319 has 16 divisors (see below), whose sum is σ = 25528419840. Its totient is φ = 17231654880.

The previous prime is 21212020267. The next prime is 21212020369. The reversal of 21212020319 is 91302021212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21212020319 - 2¹² = 21212016223 is a prime.

It is a super-2 number, since 2×21212020319² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 21212020294 and 21212020303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212020369) 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, 586817 + ... + 621914.

It is an arithmetic number, because the mean of its divisors is an integer number (1595526240).

Almost surely, 2^21212020319 is an apocalyptic number.

21212020319 is a deficient number, since it is larger than the sum of its proper divisors (4316399521).

21212020319 is a wasteful number, since it uses less digits than its factorization.

21212020319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208870.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21212020319 in words is "twenty-one billion, two hundred twelve million, twenty thousand, three hundred nineteen".