1012212001021 has 32 divisors (see below), whose sum is σ = 1174500014688. Its totient is φ = 863952445440.

The previous prime is 1012212000983. The next prime is 1012212001027. The reversal of 1012212001021 is 1201002122101.

It can be written as a sum of positive squares in 16 ways, for example, as 55505004025 + 956706996996 = 235595^2 + 978114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012212001021 - 2¹³ = 1012211992829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1012212000992 and 1012212001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012212001027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11509411 + ... + 11597023.

It is an arithmetic number, because the mean of its divisors is an integer number (36703125459).

Almost surely, 2^{1012212001021} is an apocalyptic number.

It is an amenable number.

1012212001021 is a deficient number, since it is larger than the sum of its proper divisors (162288013667).

1012212001021 is a wasteful number, since it uses less digits than its factorization.

1012212001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88561.

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

Adding to 1012212001021 its reverse (1201002122101), we get a palindrome (2213214123122).

The spelling of 1012212001021 in words is "one trillion, twelve billion, two hundred twelve million, one thousand, twenty-one".