1223021534 has 16 divisors (see below), whose sum is σ = 2136168288. Its totient is φ = 514262112.

The previous prime is 1223021491. The next prime is 1223021537. The reversal of 1223021534 is 4351203221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223021537) 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, 823397 + ... + 824880.

It is an arithmetic number, because the mean of its divisors is an integer number (133510518).

Almost surely, 2^1223021534 is an apocalyptic number.

1223021534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1223021534 is a deficient number, since it is larger than the sum of its proper divisors (913146754).

1223021534 is a wasteful number, since it uses less digits than its factorization.

1223021534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648339.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1223021534 is about 34971.7247787409. The cubic root of 1223021534 is about 1069.4111337507.

Adding to 1223021534 its reverse (4351203221), we get a palindrome (5574224755).

The spelling of 1223021534 in words is "one billion, two hundred twenty-three million, twenty-one thousand, five hundred thirty-four".