21145343013 has 6 divisors (see below), whose sum is σ = 30543273254. Its totient is φ = 14096895336.

The previous prime is 21145342913. The next prime is 21145343033. The reversal of 21145343013 is 31034354112.

It is a happy number.

21145343013 is a `hidden beast` number, since 2 + 114 + 534 + 3 + 0 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13142788164 + 8002554849 = 114642^2 + 89457^2 .

It is not a de Polignac number, because 21145343013 - 2¹⁰ = 21145341989 is a prime.

It is a super-2 number, since 2×21145343013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145343033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1174741270 + ... + 1174741287.

Almost surely, 2^21145343013 is an apocalyptic number.

It is an amenable number.

21145343013 is a deficient number, since it is larger than the sum of its proper divisors (9397930241).

21145343013 is a wasteful number, since it uses less digits than its factorization.

21145343013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349482563 (or 2349482560 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21145343013 its reverse (31034354112), we get a palindrome (52179697125).

The spelling of 21145343013 in words is "twenty-one billion, one hundred forty-five million, three hundred forty-three thousand, thirteen".