21125230013 has 16 divisors (see below), whose sum is σ = 22935032064. Its totient is φ = 19381824000.

The previous prime is 21125229989. The next prime is 21125230043. The reversal of 21125230013 is 31003252112.

It is a cyclic number.

It is not a de Polignac number, because 21125230013 - 2¹⁰ = 21125228989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125230043) 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, 147881 + ... + 253217.

It is an arithmetic number, because the mean of its divisors is an integer number (1433439504).

Almost surely, 2^21125230013 is an apocalyptic number.

It is an amenable number.

21125230013 is a deficient number, since it is larger than the sum of its proper divisors (1809802051).

21125230013 is a wasteful number, since it uses less digits than its factorization.

21125230013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105652.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21125230013 its reverse (31003252112), we get a palindrome (52128482125).

The spelling of 21125230013 in words is "twenty-one billion, one hundred twenty-five million, two hundred thirty thousand, thirteen".