1221301102021 has 32 divisors (see below), whose sum is σ = 1640475648000. Its totient is φ = 878090431680.

The previous prime is 1221301102003. The next prime is 1221301102039. The reversal of 1221301102021 is 1202011031221.

It is an interprime number because it is at equal distance from previous prime (1221301102003) and next prime (1221301102039).

It is not a de Polignac number, because 1221301102021 - 2⁵ = 1221301101989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221301101986 and 1221301102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221301102051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2147110 + ... + 2655688.

It is an arithmetic number, because the mean of its divisors is an integer number (51264864000).

Almost surely, 2^{1221301102021} is an apocalyptic number.

1221301102021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221301102021 is a deficient number, since it is larger than the sum of its proper divisors (419174545979).

1221301102021 is a wasteful number, since it uses less digits than its factorization.

1221301102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511009.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221301102021 its reverse (1202011031221), we get a palindrome (2423312133242).

The spelling of 1221301102021 in words is "one trillion, two hundred twenty-one billion, three hundred one million, one hundred two thousand, twenty-one".