21030404240031 has 8 divisors (see below), whose sum is σ = 28040673333504. Its totient is φ = 14020202319960.

The previous prime is 21030404240003. The next prime is 21030404240051. The reversal of 21030404240031 is 13004240403012.

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

It is not a de Polignac number, because 21030404240031 - 2¹⁸ = 21030403977887 is a prime.

It is a super-2 number, since 2×21030404240031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21030404239983 and 21030404240010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030404240051) 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, 16058241 + ... + 17318426.

It is an arithmetic number, because the mean of its divisors is an integer number (3505084166688).

Almost surely, 2^{21030404240031} is an apocalyptic number.

21030404240031 is a deficient number, since it is larger than the sum of its proper divisors (7010269093473).

21030404240031 is a wasteful number, since it uses less digits than its factorization.

21030404240031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33586701.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21030404240031 its reverse (13004240403012), we get a palindrome (34034644643043).

The spelling of 21030404240031 in words is "twenty-one trillion, thirty billion, four hundred four million, two hundred forty thousand, thirty-one".