21340102031 has 4 divisors (see below), whose sum is σ = 21409614072. Its totient is φ = 21270589992.

The previous prime is 21340102009. The next prime is 21340102067. The reversal of 21340102031 is 13020104312.

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

It is a cyclic number.

It is not a de Polignac number, because 21340102031 - 2¹⁰ = 21340101007 is a prime.

It is a super-2 number, since 2×21340102031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340102001) 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, 34755560 + ... + 34756173.

It is an arithmetic number, because the mean of its divisors is an integer number (5352403518).

Almost surely, 2^21340102031 is an apocalyptic number.

21340102031 is a deficient number, since it is larger than the sum of its proper divisors (69512041).

21340102031 is an equidigital number, since it uses as much as digits as its factorization.

21340102031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69512040.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21340102031 its reverse (13020104312), we get a palindrome (34360206343).

The spelling of 21340102031 in words is "twenty-one billion, three hundred forty million, one hundred two thousand, thirty-one".