21125100027 has 8 divisors (see below), whose sum is σ = 28169364816. Its totient is φ = 14082117632.

The previous prime is 21125100019. The next prime is 21125100041. The reversal of 21125100027 is 72000152112.

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 21125100027 - 2³ = 21125100019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21125099976 and 21125100012.

It is not an unprimeable number, because it can be changed into a prime (21125100127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281478 + ... + 348539.

It is an arithmetic number, because the mean of its divisors is an integer number (3521170602).

Almost surely, 2^21125100027 is an apocalyptic number.

21125100027 is a deficient number, since it is larger than the sum of its proper divisors (7044264789).

21125100027 is a wasteful number, since it uses less digits than its factorization.

21125100027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641197.

The product of its (nonzero) digits is 280, while the sum is 21.

Adding to 21125100027 its reverse (72000152112), we get a palindrome (93125252139).

The spelling of 21125100027 in words is "twenty-one billion, one hundred twenty-five million, one hundred thousand, twenty-seven".