1220122210021 has 64 divisors (see below), whose sum is σ = 1478339444736. Its totient is φ = 992438784000.

The previous prime is 1220122210001. The next prime is 1220122210033. The reversal of 1220122210021 is 1200122210221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1220122210021 - 2³⁷ = 1082683256549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220122209977 and 1220122210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220122210001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 144440220 + ... + 144448666.

It is an arithmetic number, because the mean of its divisors is an integer number (23099053824).

Almost surely, 2^{1220122210021} is an apocalyptic number.

1220122210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220122210021 is a deficient number, since it is larger than the sum of its proper divisors (258217234715).

1220122210021 is a wasteful number, since it uses less digits than its factorization.

1220122210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8782.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1220122210021 its reverse (1200122210221), we get a palindrome (2420244420242).

It can be divided in two parts, 12201 and 22210021, that added together give a palindrome (22222222).

The spelling of 1220122210021 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred ten thousand, twenty-one".