21230003131 has 4 divisors (see below), whose sum is σ = 21235196664. Its totient is φ = 21224809600.

The previous prime is 21230003107. The next prime is 21230003147. The reversal of 21230003131 is 13130003212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230003131 is a prime.

It is a super-2 number, since 2×21230003131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230000131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2590630 + ... + 2598811.

It is an arithmetic number, because the mean of its divisors is an integer number (5308799166).

Almost surely, 2^21230003131 is an apocalyptic number.

21230003131 is a deficient number, since it is larger than the sum of its proper divisors (5193533).

21230003131 is an equidigital number, since it uses as much as digits as its factorization.

21230003131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5193532.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21230003131 its reverse (13130003212), we get a palindrome (34360006343).

The spelling of 21230003131 in words is "twenty-one billion, two hundred thirty million, three thousand, one hundred thirty-one".