1201504021 has 2 divisors, whose sum is σ = 1201504022. Its totient is φ = 1201504020.

The previous prime is 1201504001. The next prime is 1201504063. The reversal of 1201504021 is 1204051021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197852100 + 3651921 = 34610^2 + 1911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201504021 - 2¹³ = 1201495829 is a prime.

It is a super-2 number, since 2×1201504021² = 2887223824958336882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201503986 and 1201504004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201504001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600752010 + 600752011.

It is an arithmetic number, because the mean of its divisors is an integer number (600752011).

Almost surely, 2^1201504021 is an apocalyptic number.

It is an amenable number.

1201504021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201504021 is an equidigital number, since it uses as much as digits as its factorization.

1201504021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1201504021 is about 34662.7180267214. The cubic root of 1201504021 is about 1063.1023451663.

Adding to 1201504021 its reverse (1204051021), we get a palindrome (2405555042).

The spelling of 1201504021 in words is "one billion, two hundred one million, five hundred four thousand, twenty-one".