1212011020021 has 8 divisors (see below), whose sum is σ = 1253820051000. Its totient is φ = 1170203025600.

The previous prime is 1212011019997. The next prime is 1212011020067. The reversal of 1212011020021 is 1200201102121.

It can be written as a sum of positive squares in 4 ways, for example, as 857640835921 + 354370184100 = 926089^2 + 595290^2 .

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 1212011020021 - 2³⁷ = 1074572066549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212011019983 and 1212011020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212011021021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2687955 + ... + 3106303.

It is an arithmetic number, because the mean of its divisors is an integer number (156727506375).

Almost surely, 2^{1212011020021} is an apocalyptic number.

It is an amenable number.

1212011020021 is a deficient number, since it is larger than the sum of its proper divisors (41809030979).

1212011020021 is an equidigital number, since it uses as much as digits as its factorization.

1212011020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518279.

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

Adding to 1212011020021 its reverse (1200201102121), we get a palindrome (2412212122142).

The spelling of 1212011020021 in words is "one trillion, two hundred twelve billion, eleven million, twenty thousand, twenty-one".