20101222021 has 8 divisors (see below), whose sum is σ = 20383416704. Its totient is φ = 19820557440.

The previous prime is 20101222019. The next prime is 20101222039. The reversal of 20101222021 is 12022210102.

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 20101222021 - 2¹ = 20101222019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101221992 and 20101222010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101222051) 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, 356055 + ... + 408628.

It is an arithmetic number, because the mean of its divisors is an integer number (2547927088).

Almost surely, 2^20101222021 is an apocalyptic number.

It is an amenable number.

20101222021 is a deficient number, since it is larger than the sum of its proper divisors (282194683).

20101222021 is an equidigital number, since it uses as much as digits as its factorization.

20101222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765051.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20101222021 its reverse (12022210102), we get a palindrome (32123432123).

The spelling of 20101222021 in words is "twenty billion, one hundred one million, two hundred twenty-two thousand, twenty-one".