21013051145 has 4 divisors (see below), whose sum is σ = 25215661380. Its totient is φ = 16810440912.

The previous prime is 21013051141. The next prime is 21013051231. The reversal of 21013051145 is 54115031012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2391992464 + 18621058681 = 48908^2 + 136459^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013051145 - 2² = 21013051141 is a prime.

It is a super-2 number, since 2×21013051145² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21013051145.

It is not an unprimeable number, because it can be changed into a prime (21013051141) 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, 2101305110 + ... + 2101305119.

It is an arithmetic number, because the mean of its divisors is an integer number (6303915345).

Almost surely, 2^21013051145 is an apocalyptic number.

It is an amenable number.

21013051145 is a deficient number, since it is larger than the sum of its proper divisors (4202610235).

21013051145 is an equidigital number, since it uses as much as digits as its factorization.

21013051145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202610234.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21013051145 its reverse (54115031012), we get a palindrome (75128082157).

The spelling of 21013051145 in words is "twenty-one billion, thirteen million, fifty-one thousand, one hundred forty-five".