1212020110021 has 8 divisors (see below), whose sum is σ = 1389157675200. Its totient is φ = 1035880503648.

The previous prime is 1212020109961. The next prime is 1212020110031. The reversal of 1212020110021 is 1200110202121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212020110021 - 2²¹ = 1212018012869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212020109983 and 1212020110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212020110031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249487096 + ... + 249491953.

It is an arithmetic number, because the mean of its divisors is an integer number (173644709400).

Almost surely, 2^{1212020110021} is an apocalyptic number.

It is an amenable number.

1212020110021 is a deficient number, since it is larger than the sum of its proper divisors (177137565179).

1212020110021 is an equidigital number, since it uses as much as digits as its factorization.

1212020110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498979403.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1212020110021 its reverse (1200110202121), we get a palindrome (2412130312142).

The spelling of 1212020110021 in words is "one trillion, two hundred twelve billion, twenty million, one hundred ten thousand, twenty-one".