1221610023 has 24 divisors (see below), whose sum is σ = 1778727600. Its totient is φ = 807886464.

The previous prime is 1221610001. The next prime is 1221610037. The reversal of 1221610023 is 3200161221.

1221610023 is a `hidden beast` number, since 12 + 21 + 610 + 0 + 23 = 666.

It is not a de Polignac number, because 1221610023 - 2¹² = 1221605927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221609978 and 1221610005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221610723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 993373 + ... + 994601.

It is an arithmetic number, because the mean of its divisors is an integer number (74113650).

Almost surely, 2^1221610023 is an apocalyptic number.

1221610023 is a deficient number, since it is larger than the sum of its proper divisors (557117577).

1221610023 is a wasteful number, since it uses less digits than its factorization.

1221610023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031 (or 2028 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1221610023 is about 34951.5382064939. The cubic root of 1221610023 is about 1068.9995665467. Note that the first 3 decimals are identical.

Adding to 1221610023 its reverse (3200161221), we get a palindrome (4421771244).

The spelling of 1221610023 in words is "one billion, two hundred twenty-one million, six hundred ten thousand, twenty-three".