201022100021 has 8 divisors (see below), whose sum is σ = 212855373720. Its totient is φ = 189189764608.

The previous prime is 201022099961. The next prime is 201022100023. The reversal of 201022100021 is 120001220102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 121512199396 + 79509900625 = 348586^2 + 281975^2 .

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 201022100021 - 2¹⁴ = 201022083637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201022099975 and 201022100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201022100023) 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, 233195 + ... + 675591.

It is an arithmetic number, because the mean of its divisors is an integer number (26606921715).

Almost surely, 2^201022100021 is an apocalyptic number.

It is an amenable number.

201022100021 is a deficient number, since it is larger than the sum of its proper divisors (11833273699).

201022100021 is a wasteful number, since it uses less digits than its factorization.

201022100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469143.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201022100021 its reverse (120001220102), we get a palindrome (321023320123).

The spelling of 201022100021 in words is "two hundred one billion, twenty-two million, one hundred thousand, twenty-one".