1220020621 has 16 divisors (see below), whose sum is σ = 1277856000. Its totient is φ = 1163942208.

The previous prime is 1220020601. The next prime is 1220020651. The reversal of 1220020621 is 1260200221.

It is a cyclic number.

It is not a de Polignac number, because 1220020621 - 2¹⁷ = 1219889549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220020595 and 1220020604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220020601) 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, 278355 + ... + 282703.

It is an arithmetic number, because the mean of its divisors is an integer number (79866000).

Almost surely, 2^1220020621 is an apocalyptic number.

It is an amenable number.

1220020621 is a deficient number, since it is larger than the sum of its proper divisors (57835379).

1220020621 is an equidigital number, since it uses as much as digits as its factorization.

1220020621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220020621 is about 34928.7935806549. The cubic root of 1220020621 is about 1068.5357503749.

Adding to 1220020621 its reverse (1260200221), we get a palindrome (2480220842).

The spelling of 1220020621 in words is "one billion, two hundred twenty million, twenty thousand, six hundred twenty-one".