21232145057 has 16 divisors (see below), whose sum is σ = 22320876240. Its totient is φ = 20169848832.

The previous prime is 21232144981. The next prime is 21232145059. The reversal of 21232145057 is 75054123212.

It can be written as a sum of positive squares in 8 ways, for example, as 1240730176 + 19991414881 = 35224^2 + 141391^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232145057 - 2¹² = 21232140961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232145059) 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, 425303 + ... + 472595.

It is an arithmetic number, because the mean of its divisors is an integer number (1395054765).

Almost surely, 2^21232145057 is an apocalyptic number.

It is an amenable number.

21232145057 is a deficient number, since it is larger than the sum of its proper divisors (1088731183).

21232145057 is a wasteful number, since it uses less digits than its factorization.

21232145057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47572.

The product of its (nonzero) digits is 16800, while the sum is 32.

Adding to 21232145057 its reverse (75054123212), we get a palindrome (96286268269).

The spelling of 21232145057 in words is "twenty-one billion, two hundred thirty-two million, one hundred forty-five thousand, fifty-seven".