21420302031 has 12 divisors (see below), whose sum is σ = 31695081600. Its totient is φ = 13931903520.

The previous prime is 21420302027. The next prime is 21420302041. The reversal of 21420302031 is 13020302412.

It is not a de Polignac number, because 21420302031 - 2² = 21420302027 is a prime.

It is a super-2 number, since 2×21420302031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21420301995 and 21420302013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420302011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29024431 + ... + 29025168.

It is an arithmetic number, because the mean of its divisors is an integer number (2641256800).

Almost surely, 2^21420302031 is an apocalyptic number.

21420302031 is a deficient number, since it is larger than the sum of its proper divisors (10274779569).

21420302031 is a wasteful number, since it uses less digits than its factorization.

21420302031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58049646 (or 58049643 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21420302031 its reverse (13020302412), we get a palindrome (34440604443).

The spelling of 21420302031 in words is "twenty-one billion, four hundred twenty million, three hundred two thousand, thirty-one".