20021225431 has 8 divisors (see below), whose sum is σ = 21204968400. Its totient is φ = 18838151808.

The previous prime is 20021225423. The next prime is 20021225459. The reversal of 20021225431 is 13452212002.

It is a happy number.

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 20021225431 - 2³ = 20021225423 is a prime.

It is a super-2 number, since 2×20021225431² (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 (20021225491) 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, 105081 + ... + 226018.

It is an arithmetic number, because the mean of its divisors is an integer number (2650621050).

Almost surely, 2^20021225431 is an apocalyptic number.

20021225431 is a deficient number, since it is larger than the sum of its proper divisors (1183742969).

20021225431 is a wasteful number, since it uses less digits than its factorization.

20021225431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334673.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20021225431 its reverse (13452212002), we get a palindrome (33473437433).

The spelling of 20021225431 in words is "twenty billion, twenty-one million, two hundred twenty-five thousand, four hundred thirty-one".