21213011145 has 16 divisors (see below), whose sum is σ = 35937336960. Its totient is φ = 10648099584.

The previous prime is 21213011123. The next prime is 21213011167. The reversal of 21213011145 is 54111031212.

It is an interprime number because it is at equal distance from previous prime (21213011123) and next prime (21213011167).

It is not a de Polignac number, because 21213011145 - 2¹³ = 21213002953 is a prime.

It is a super-2 number, since 2×21213011145² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41593885 + ... + 41594394.

It is an arithmetic number, because the mean of its divisors is an integer number (2246083560).

Almost surely, 2^21213011145 is an apocalyptic number.

It is an amenable number.

21213011145 is a deficient number, since it is larger than the sum of its proper divisors (14724325815).

21213011145 is a wasteful number, since it uses less digits than its factorization.

21213011145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83188304.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 21213011145 its reverse (54111031212), we get a palindrome (75324042357).

The spelling of 21213011145 in words is "twenty-one billion, two hundred thirteen million, eleven thousand, one hundred forty-five".