1353205021 has 6 divisors (see below), whose sum is σ = 1574136510. Its totient is φ = 1159889976.

The previous prime is 1353205003. The next prime is 1353205031. The reversal of 1353205021 is 1205023531.

It can be written as a sum of positive squares in only one way, i.e., 1227451225 + 125753796 = 35035^2 + 11214^2 .

It is not a de Polignac number, because 1353205021 - 2²⁵ = 1319650589 is a prime.

It is a super-2 number, since 2×1353205021² = 3662327657719220882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1353204983 and 1353205001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1353205001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13808166 + ... + 13808263.

It is an arithmetic number, because the mean of its divisors is an integer number (262356085).

Almost surely, 2^1353205021 is an apocalyptic number.

It is an amenable number.

1353205021 is a deficient number, since it is larger than the sum of its proper divisors (220931489).

1353205021 is an equidigital number, since it uses as much as digits as its factorization.

1353205021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27616443 (or 27616436 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 1353205021 is about 36785.9350975342. The cubic root of 1353205021 is about 1106.0833804574.

Adding to 1353205021 its reverse (1205023531), we get a palindrome (2558228552).

The spelling of 1353205021 in words is "one billion, three hundred fifty-three million, two hundred five thousand, twenty-one".