1220421111025 has 12 divisors (see below), whose sum is σ = 1513572625152. Its totient is φ = 976175309840.

The previous prime is 1220421111011. The next prime is 1220421111067. The reversal of 1220421111025 is 5201111240221.

It is not a de Polignac number, because 1220421111025 - 2¹⁵ = 1220421078257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220421110987 and 1220421111005.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3885277 + ... + 4187626.

It is an arithmetic number, because the mean of its divisors is an integer number (126131052096).

Almost surely, 2^{1220421111025} is an apocalyptic number.

It is an amenable number.

1220421111025 is a deficient number, since it is larger than the sum of its proper divisors (293151514127).

1220421111025 is an equidigital number, since it uses as much as digits as its factorization.

1220421111025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8078960 (or 8078955 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 1220421111025 its reverse (5201111240221), we get a palindrome (6421532351246).

The spelling of 1220421111025 in words is "one trillion, two hundred twenty billion, four hundred twenty-one million, one hundred eleven thousand, twenty-five".