21425133031 has 8 divisors (see below), whose sum is σ = 22732025760. Its totient is φ = 20123417088.

The previous prime is 21425133019. The next prime is 21425133043. The reversal of 21425133031 is 13033152412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21425133019) and next prime (21425133043).

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

It is a cyclic number.

It is not a de Polignac number, because 21425133031 - 2⁵ = 21425132999 is a prime.

It is a super-2 number, since 2×21425133031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21425132987 and 21425133005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425133071) 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, 1285666 + ... + 1302223.

It is an arithmetic number, because the mean of its divisors is an integer number (2841503220).

Almost surely, 2^21425133031 is an apocalyptic number.

21425133031 is a deficient number, since it is larger than the sum of its proper divisors (1306892729).

21425133031 is a wasteful number, since it uses less digits than its factorization.

21425133031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588393.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21425133031 its reverse (13033152412), we get a palindrome (34458285443).

The spelling of 21425133031 in words is "twenty-one billion, four hundred twenty-five million, one hundred thirty-three thousand, thirty-one".