1220022220021 has 32 divisors (see below), whose sum is σ = 1353470000256. Its totient is φ = 1090504800000.

The previous prime is 1220022220013. The next prime is 1220022220037. The reversal of 1220022220021 is 1200222200221.

It is not a de Polignac number, because 1220022220021 - 2³ = 1220022220013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220022219977 and 1220022220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220022220051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123217171 + ... + 123227071.

It is an arithmetic number, because the mean of its divisors is an integer number (42295937508).

Almost surely, 2^{1220022220021} is an apocalyptic number.

1220022220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220022220021 is a deficient number, since it is larger than the sum of its proper divisors (133447780235).

1220022220021 is a wasteful number, since it uses less digits than its factorization.

1220022220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10773.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 1220022220021 its reverse (1200222200221), we get a palindrome (2420244420242).

It can be divided in two parts, 1 and 220022220021, that added together give a palindrome (220022220022).

The spelling of 1220022220021 in words is "one trillion, two hundred twenty billion, twenty-two million, two hundred twenty thousand, twenty-one".