1995026221 has 4 divisors (see below), whose sum is σ = 1995169500. Its totient is φ = 1994882944.

The previous prime is 1995026191. The next prime is 1995026269. The reversal of 1995026221 is 1226205991.

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 1821155625 + 173870596 = 42675^2 + 13186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1995026221 - 2⁹ = 1995025709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995026291) 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, 48196 + ... + 79453.

It is an arithmetic number, because the mean of its divisors is an integer number (498792375).

Almost surely, 2^1995026221 is an apocalyptic number.

It is an amenable number.

1995026221 is a deficient number, since it is larger than the sum of its proper divisors (143279).

1995026221 is a wasteful number, since it uses less digits than its factorization.

1995026221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143278.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1995026221 is about 44665.7163941204. The cubic root of 1995026221 is about 1258.8757547610.

The spelling of 1995026221 in words is "one billion, nine hundred ninety-five million, twenty-six thousand, two hundred twenty-one".