21023541145 has 8 divisors (see below), whose sum is σ = 25358966856. Its totient is φ = 16731687936.

The previous prime is 21023541137. The next prime is 21023541239. The reversal of 21023541145 is 54114532012.

It can be written as a sum of positive squares in 4 ways, for example, as 527896576 + 20495644569 = 22976^2 + 143163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21023541145 - 2³ = 21023541137 is a prime.

It is a super-2 number, since 2×21023541145² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10892062 + ... + 10893991.

It is an arithmetic number, because the mean of its divisors is an integer number (3169870857).

Almost surely, 2^21023541145 is an apocalyptic number.

It is an amenable number.

21023541145 is a deficient number, since it is larger than the sum of its proper divisors (4335425711).

21023541145 is a wasteful number, since it uses less digits than its factorization.

21023541145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21786251.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21023541145 in words is "twenty-one billion, twenty-three million, five hundred forty-one thousand, one hundred forty-five".