1221420114021 has 16 divisors (see below), whose sum is σ = 1760605572800. Its totient is φ = 750573952128.

The previous prime is 1221420114001. The next prime is 1221420114107. The reversal of 1221420114021 is 1204110241221.

It is not a de Polignac number, because 1221420114021 - 2⁵ = 1221420113989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221420114001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289571176 + ... + 289575393.

It is an arithmetic number, because the mean of its divisors is an integer number (110037848300).

Almost surely, 2^{1221420114021} is an apocalyptic number.

It is an amenable number.

1221420114021 is a deficient number, since it is larger than the sum of its proper divisors (539185458779).

1221420114021 is a wasteful number, since it uses less digits than its factorization.

1221420114021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579146628.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 1221420114021 its reverse (1204110241221), we get a palindrome (2425530355242).

The spelling of 1221420114021 in words is "one trillion, two hundred twenty-one billion, four hundred twenty million, one hundred fourteen thousand, twenty-one".