1900021220102 has 4 divisors (see below), whose sum is σ = 2850031830156. Its totient is φ = 950010610050.

The previous prime is 1900021220101. The next prime is 1900021220113. The reversal of 1900021220102 is 2010221200091.

It is a happy number.

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

It is a super-2 number, since 2×1900021220102² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900021220101) 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, 475005305024 + ... + 475005305027.

It is an arithmetic number, because the mean of its divisors is an integer number (712507957539).

Almost surely, 2^{1900021220102} is an apocalyptic number.

1900021220102 is a deficient number, since it is larger than the sum of its proper divisors (950010610054).

1900021220102 is an equidigital number, since it uses as much as digits as its factorization.

1900021220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950010610053.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1900021220102 its reverse (2010221200091), we get a palindrome (3910242420193).

The spelling of 1900021220102 in words is "one trillion, nine hundred billion, twenty-one million, two hundred twenty thousand, one hundred two".