1455213021 has 24 divisors (see below), whose sum is σ = 2072579040. Its totient is φ = 907952544.

The previous prime is 1455213007. The next prime is 1455213043. The reversal of 1455213021 is 1203125541.

It is a happy number.

It is not a de Polignac number, because 1455213021 - 2¹⁷ = 1455081949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1455212982 and 1455213000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1455214021) 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 in 23 ways as a sum of consecutive naturals, for example, 81795 + ... + 97983.

It is an arithmetic number, because the mean of its divisors is an integer number (86357460).

Almost surely, 2^1455213021 is an apocalyptic number.

It is an amenable number.

1455213021 is a deficient number, since it is larger than the sum of its proper divisors (617366019).

1455213021 is a wasteful number, since it uses less digits than its factorization.

1455213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16313 (or 16294 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1455213021 is about 38147.2544359355. The cubic root of 1455213021 is about 1133.2059792209.

Adding to 1455213021 its reverse (1203125541), we get a palindrome (2658338562).

The spelling of 1455213021 in words is "one billion, four hundred fifty-five million, two hundred thirteen thousand, twenty-one".