1212021000001 has 6 divisors (see below), whose sum is σ = 1409901979650. Its totient is φ = 1038875142816.

The previous prime is 1212020999977. The next prime is 1212021000013. The reversal of 1212021000001 is 1000001202121.

It can be written as a sum of positive squares in only one way, i.e., 787125614401 + 424895385600 = 887201^2 + 651840^2 .

It is not a de Polignac number, because 1212021000001 - 2⁷ = 1212020999873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212021000041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12367561176 + ... + 12367561273.

It is an arithmetic number, because the mean of its divisors is an integer number (234983663275).

Almost surely, 2^{1212021000001} is an apocalyptic number.

It is an amenable number.

1212021000001 is a deficient number, since it is larger than the sum of its proper divisors (197880979649).

1212021000001 is an equidigital number, since it uses as much as digits as its factorization.

1212021000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24735122463 (or 24735122456 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1212021000001 its reverse (1000001202121), we get a palindrome (2212022202122).

The spelling of 1212021000001 in words is "one trillion, two hundred twelve billion, twenty-one million, one", and thus it is an aban number.