1601226021 has 4 divisors (see below), whose sum is σ = 2134968032. Its totient is φ = 1067484012.

The previous prime is 1601226017. The next prime is 1601226037. The reversal of 1601226021 is 1206221061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1601226021 - 2² = 1601226017 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 (1601226041) 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, 266871001 + ... + 266871006.

It is an arithmetic number, because the mean of its divisors is an integer number (533742008).

Almost surely, 2^1601226021 is an apocalyptic number.

It is an amenable number.

1601226021 is a deficient number, since it is larger than the sum of its proper divisors (533742011).

1601226021 is an equidigital number, since it uses as much as digits as its factorization.

1601226021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533742010.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1601226021 is about 40015.3223278284. The cubic root of 1601226021 is about 1169.9057612752.

Adding to 1601226021 its reverse (1206221061), we get a palindrome (2807447082).

The spelling of 1601226021 in words is "one billion, six hundred one million, two hundred twenty-six thousand, twenty-one".