1021212120021 has 8 divisors (see below), whose sum is σ = 1365729805344. Its totient is φ = 678751257360.

The previous prime is 1021212120001. The next prime is 1021212120083. The reversal of 1021212120021 is 1200212121201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021212120021 - 2³⁵ = 986852381653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021212120001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514204506 + ... + 514206491.

It is an arithmetic number, because the mean of its divisors is an integer number (170716225668).

Almost surely, 2^{1021212120021} is an apocalyptic number.

It is an amenable number.

1021212120021 is a deficient number, since it is larger than the sum of its proper divisors (344517685323).

1021212120021 is a wasteful number, since it uses less digits than its factorization.

1021212120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028411331.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1021212120021 its reverse (1200212121201), we get a palindrome (2221424241222).

The spelling of 1021212120021 in words is "one trillion, twenty-one billion, two hundred twelve million, one hundred twenty thousand, twenty-one".