1905490301221 has 8 divisors (see below), whose sum is σ = 2052553154904. Its totient is φ = 1758496972800.

The previous prime is 1905490301213. The next prime is 1905490301369. The reversal of 1905490301221 is 1221030945091.

It can be written as a sum of positive squares in 4 ways, for example, as 765957536100 + 1139532765121 = 875190^2 + 1067489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1905490301221 - 2³ = 1905490301213 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 (1905490361221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17324380 + ... + 17434021.

It is an arithmetic number, because the mean of its divisors is an integer number (256569144363).

Almost surely, 2^{1905490301221} is an apocalyptic number.

It is an amenable number.

1905490301221 is a deficient number, since it is larger than the sum of its proper divisors (147062853683).

1905490301221 is a wasteful number, since it uses less digits than its factorization.

1905490301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34762631.

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

The spelling of 1905490301221 in words is "one trillion, nine hundred five billion, four hundred ninety million, three hundred one thousand, two hundred twenty-one".