1021002212121 has 8 divisors (see below), whose sum is σ = 1420524816960. Its totient is φ = 651073874352.

The previous prime is 1021002212107. The next prime is 1021002212123. The reversal of 1021002212121 is 1212122001201.

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

It is not a de Polignac number, because 1021002212121 - 2⁹ = 1021002211609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021002212121.

It is not an unprimeable number, because it can be changed into a prime (1021002212123) 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, 7398566686 + ... + 7398566823.

It is an arithmetic number, because the mean of its divisors is an integer number (177565602120).

Almost surely, 2^{1021002212121} is an apocalyptic number.

It is an amenable number.

1021002212121 is a deficient number, since it is larger than the sum of its proper divisors (399522604839).

1021002212121 is a wasteful number, since it uses less digits than its factorization.

1021002212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14797133535.

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

Adding to 1021002212121 its reverse (1212122001201), we get a palindrome (2233124213322).

The spelling of 1021002212121 in words is "one trillion, twenty-one billion, two million, two hundred twelve thousand, one hundred twenty-one".