1020012122021 has 4 divisors (see below), whose sum is σ = 1030111252044. Its totient is φ = 1009912992000.

The previous prime is 1020012121991. The next prime is 1020012122027. The reversal of 1020012122021 is 1202212100201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 793193296996 + 226818825025 = 890614^2 + 476255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020012122021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020012121987 and 1020012122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020012122027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5049564860 + ... + 5049565061.

It is an arithmetic number, because the mean of its divisors is an integer number (257527813011).

Almost surely, 2^{1020012122021} is an apocalyptic number.

It is an amenable number.

1020012122021 is a deficient number, since it is larger than the sum of its proper divisors (10099130023).

1020012122021 is a wasteful number, since it uses less digits than its factorization.

1020012122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10099130022.

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

Adding to 1020012122021 its reverse (1202212100201), we get a palindrome (2222224222222).

The spelling of 1020012122021 in words is "one trillion, twenty billion, twelve million, one hundred twenty-two thousand, twenty-one".