1220110100021 has 4 divisors (see below), whose sum is σ = 1234810221792. Its totient is φ = 1205409978252.

The previous prime is 1220110100003. The next prime is 1220110100029. The reversal of 1220110100021 is 1200010110221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220110100021 - 2¹⁴ = 1220110083637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220110099975 and 1220110100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220110100029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7350060761 + ... + 7350060926.

It is an arithmetic number, because the mean of its divisors is an integer number (308702555448).

Almost surely, 2^{1220110100021} is an apocalyptic number.

It is an amenable number.

1220110100021 is a deficient number, since it is larger than the sum of its proper divisors (14700121771).

1220110100021 is an equidigital number, since it uses as much as digits as its factorization.

1220110100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14700121770.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1220110100021 its reverse (1200010110221), we get a palindrome (2420120210242).

The spelling of 1220110100021 in words is "one trillion, two hundred twenty billion, one hundred ten million, one hundred thousand, twenty-one".