1900021220101 has 2 divisors, whose sum is σ = 1900021220102. Its totient is φ = 1900021220100.

The previous prime is 1900021219981. The next prime is 1900021220113. The reversal of 1900021220101 is 1010221200091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1814748459876 + 85272760225 = 1347126^2 + 292015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1900021220101 - 2¹³ = 1900021211909 is a prime.

It is a super-2 number, since 2×1900021220101² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1900021220501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950010610050 + 950010610051.

It is an arithmetic number, because the mean of its divisors is an integer number (950010610051).

Almost surely, 2^{1900021220101} is an apocalyptic number.

It is an amenable number.

1900021220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900021220101 is an equidigital number, since it uses as much as digits as its factorization.

1900021220101 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1900021220101 its reverse (1010221200091), we get a palindrome (2910242420192).

The spelling of 1900021220101 in words is "one trillion, nine hundred billion, twenty-one million, two hundred twenty thousand, one hundred one".