1242421202021 has 32 divisors (see below), whose sum is σ = 1308887424000. Its totient is φ = 1177925322240.

The previous prime is 1242421201979. The next prime is 1242421202041. The reversal of 1242421202021 is 1202021242421.

It is not a de Polignac number, because 1242421202021 - 2¹⁰ = 1242421200997 is a prime.

It is a super-2 number, since 2×1242421202021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242421202041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115150895 + ... + 115161683.

It is an arithmetic number, because the mean of its divisors is an integer number (40902732000).

Almost surely, 2^{1242421202021} is an apocalyptic number.

It is an amenable number.

1242421202021 is a deficient number, since it is larger than the sum of its proper divisors (66466221979).

1242421202021 is a wasteful number, since it uses less digits than its factorization.

1242421202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11309.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 1242421202021 its reverse (1202021242421), we get a palindrome (2444442444442).

The spelling of 1242421202021 in words is "one trillion, two hundred forty-two billion, four hundred twenty-one million, two hundred two thousand, twenty-one".