21300121131 has 8 divisors (see below), whose sum is σ = 28401140880. Its totient is φ = 14199591072.

The previous prime is 21300121127. The next prime is 21300121147. The reversal of 21300121131 is 13112100312.

It is a happy number.

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

It is not a de Polignac number, because 21300121131 - 2² = 21300121127 is a prime.

It is a super-2 number, since 2×21300121131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21300121131.

It is not an unprimeable number, because it can be changed into a prime (21300121181) 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, 4776 + ... + 206453.

It is an arithmetic number, because the mean of its divisors is an integer number (3550142610).

Almost surely, 2^21300121131 is an apocalyptic number.

21300121131 is a deficient number, since it is larger than the sum of its proper divisors (7101019749).

21300121131 is a wasteful number, since it uses less digits than its factorization.

21300121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244845.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21300121131 its reverse (13112100312), we get a palindrome (34412221443).

The spelling of 21300121131 in words is "twenty-one billion, three hundred million, one hundred twenty-one thousand, one hundred thirty-one".