1221562023 has 16 divisors (see below), whose sum is σ = 1803340416. Its totient is φ = 729289440.

The previous prime is 1221562021. The next prime is 1221562049. The reversal of 1221562023 is 3202651221.

It is not a de Polignac number, because 1221562023 - 2¹ = 1221562021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221561984 and 1221562002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221562021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274036 + ... + 278457.

It is an arithmetic number, because the mean of its divisors is an integer number (112708776).

Almost surely, 2^1221562023 is an apocalyptic number.

1221562023 is a deficient number, since it is larger than the sum of its proper divisors (581778393).

1221562023 is a wasteful number, since it uses less digits than its factorization.

1221562023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552574.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1221562023 is about 34950.8515346908. The cubic root of 1221562023 is about 1068.9855651741.

The spelling of 1221562023 in words is "one billion, two hundred twenty-one million, five hundred sixty-two thousand, twenty-three".