1201212121021 has 12 divisors (see below), whose sum is σ = 1320428473056. Its totient is φ = 1091938338920.

The previous prime is 1201212121003. The next prime is 1201212121037.

1201212121021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1201212121021 - 2¹⁹ = 1201211596733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201212120986 and 1201212121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212121091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1538670 + ... + 2184016.

It is an arithmetic number, because the mean of its divisors is an integer number (110035706088).

Almost surely, 2^{1201212121021} is an apocalyptic number.

1201212121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201212121021 is a deficient number, since it is larger than the sum of its proper divisors (119216352035).

1201212121021 is a wasteful number, since it uses less digits than its factorization.

1201212121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660752 (or 660741 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

The spelling of 1201212121021 in words is "one trillion, two hundred one billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".