1220021023 has 16 divisors (see below), whose sum is σ = 1336093920. Its totient is φ = 1107190656.

The previous prime is 1220021009. The next prime is 1220021029. The reversal of 1220021023 is 3201200221.

It is a de Polignac number, because none of the positive numbers 2^k-1220021023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220020994 and 1220021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220021029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 588633 + ... + 590701.

It is an arithmetic number, because the mean of its divisors is an integer number (83505870).

Almost surely, 2^1220021023 is an apocalyptic number.

1220021023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1220021023 is a deficient number, since it is larger than the sum of its proper divisors (116072897).

1220021023 is a wasteful number, since it uses less digits than its factorization.

1220021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1220021023 is about 34928.7993352191. The cubic root of 1220021023 is about 1068.5358677367.

Adding to 1220021023 its reverse (3201200221), we get a palindrome (4421221244).

The spelling of 1220021023 in words is "one billion, two hundred twenty million, twenty-one thousand, twenty-three".