20225310021 has 36 divisors (see below), whose sum is σ = 34774383072. Its totient is φ = 11288534544.

The previous prime is 20225309983. The next prime is 20225310041. The reversal of 20225310021 is 12001352202.

It is not a de Polignac number, because 20225310021 - 2⁶ = 20225309957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20225309976 and 20225310003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20225310041) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 514321 + ... + 552246.

Almost surely, 2^20225310021 is an apocalyptic number.

20225310021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20225310021 is a deficient number, since it is larger than the sum of its proper divisors (14549073051).

20225310021 is a wasteful number, since it uses less digits than its factorization.

20225310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066630 (or 1066620 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 20225310021 its reverse (12001352202), we get a palindrome (32226662223).

The spelling of 20225310021 in words is "twenty billion, two hundred twenty-five million, three hundred ten thousand, twenty-one".