201001002211021 has 4 divisors (see below), whose sum is σ = 201448665913500. Its totient is φ = 200553338508544.

The previous prime is 201001002211013. The next prime is 201001002211147. The reversal of 201001002211021 is 120112200100102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52293001332100 + 148708000878921 = 7231390^2 + 12194589^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001002211021 - 2³ = 201001002211013 is a prime.

It is a super-2 number, since 2×201001002211021² (a number of 29 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 = 201001002210992 and 201001002211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001002211421) 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, 223831850566 + ... + 223831851463.

It is an arithmetic number, because the mean of its divisors is an integer number (50362166478375).

Almost surely, 2^{201001002211021} is an apocalyptic number.

It is an amenable number.

201001002211021 is a deficient number, since it is larger than the sum of its proper divisors (447663702479).

201001002211021 is an equidigital number, since it uses as much as digits as its factorization.

201001002211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447663702478.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201001002211021 its reverse (120112200100102), we get a palindrome (321113202311123).

The spelling of 201001002211021 in words is "two hundred one trillion, one billion, two million, two hundred eleven thousand, twenty-one".