1210001212021 has 16 divisors (see below), whose sum is σ = 1406551466880. Its totient is φ = 1019380559040.

The previous prime is 1210001211949. The next prime is 1210001212067. The reversal of 1210001212021 is 1202121000121.

It is a cyclic number.

It is not a de Polignac number, because 1210001212021 - 2¹⁵ = 1210001179253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210001211992 and 1210001212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210001213021) 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, 2042475 + ... + 2567431.

It is an arithmetic number, because the mean of its divisors is an integer number (87909466680).

Almost surely, 2^{1210001212021} is an apocalyptic number.

It is an amenable number.

1210001212021 is a deficient number, since it is larger than the sum of its proper divisors (196550254859).

1210001212021 is an equidigital number, since it uses as much as digits as its factorization.

1210001212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530604.

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

Adding to 1210001212021 its reverse (1202121000121), we get a palindrome (2412122212142).

The spelling of 1210001212021 in words is "one trillion, two hundred ten billion, one million, two hundred twelve thousand, twenty-one".