21012130101 has 8 divisors (see below), whose sum is σ = 29664183744. Its totient is φ = 13184081600.

The previous prime is 21012130091. The next prime is 21012130109. The reversal of 21012130101 is 10103121012.

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 21012130101 - 2⁶ = 21012130037 is a prime.

It is a super-2 number, since 2×21012130101² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012130109) 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, 206001225 + ... + 206001326.

It is an arithmetic number, because the mean of its divisors is an integer number (3708022968).

Almost surely, 2^21012130101 is an apocalyptic number.

It is an amenable number.

21012130101 is a deficient number, since it is larger than the sum of its proper divisors (8652053643).

21012130101 is a wasteful number, since it uses less digits than its factorization.

21012130101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412002571.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21012130101 its reverse (10103121012), we get a palindrome (31115251113).

The spelling of 21012130101 in words is "twenty-one billion, twelve million, one hundred thirty thousand, one hundred one".