201021210001090 has 32 divisors (see below), whose sum is σ = 370672509659760. Its totient is φ = 78445394534400.

The previous prime is 201021210001069. The next prime is 201021210001091. The reversal of 201021210001090 is 90100012120102.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 68618376871641 + 132402833129449 = 8283621^2 + 11506643^2 .

It is not an unprimeable number, because it can be changed into a prime (201021210001091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10986696 + ... + 22863724.

Almost surely, 2^{201021210001090} is an apocalyptic number.

201021210001090 is a deficient number, since it is larger than the sum of its proper divisors (169651299658670).

201021210001090 is a wasteful number, since it uses less digits than its factorization.

201021210001090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11918358.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 201021210001090 its reverse (90100012120102), we get a palindrome (291121222121192).

The spelling of 201021210001090 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, one thousand, ninety".