2001212102021 has 16 divisors (see below), whose sum is σ = 2278136475648. Its totient is φ = 1740125732400.

The previous prime is 2001212102009. The next prime is 2001212102047. The reversal of 2001212102021 is 1202012121002.

It is not a de Polignac number, because 2001212102021 - 2¹⁴ = 2001212085637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001212101987 and 2001212102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001212102051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8477216 + ... + 8710086.

It is an arithmetic number, because the mean of its divisors is an integer number (142383529728).

Almost surely, 2^{2001212102021} is an apocalyptic number.

It is an amenable number.

2001212102021 is a deficient number, since it is larger than the sum of its proper divisors (276924373627).

2001212102021 is a wasteful number, since it uses less digits than its factorization.

2001212102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266872.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001212102021 its reverse (1202012121002), we get a palindrome (3203224223023).

The spelling of 2001212102021 in words is "two trillion, one billion, two hundred twelve million, one hundred two thousand, twenty-one".