201220011021 has 4 divisors (see below), whose sum is σ = 268293348032. Its totient is φ = 134146674012.

The previous prime is 201220011019. The next prime is 201220011079. The reversal of 201220011021 is 120110022102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201220011021 - 2¹ = 201220011019 is a prime.

It is a super-2 number, since 2×201220011021² (a number of 23 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 = 201220010988 and 201220011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220011121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33536668501 + ... + 33536668506.

It is an arithmetic number, because the mean of its divisors is an integer number (67073337008).

Almost surely, 2^201220011021 is an apocalyptic number.

It is an amenable number.

201220011021 is a deficient number, since it is larger than the sum of its proper divisors (67073337011).

201220011021 is an equidigital number, since it uses as much as digits as its factorization.

201220011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67073337010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201220011021 its reverse (120110022102), we get a palindrome (321330033123).

The spelling of 201220011021 in words is "two hundred one billion, two hundred twenty million, eleven thousand, twenty-one".