1021002003121 has 32 divisors (see below), whose sum is σ = 1085467638528. Its totient is φ = 959001845760.

The previous prime is 1021002003107. The next prime is 1021002003149. The reversal of 1021002003121 is 1213002001201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021002003121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021002001121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 325469265 + ... + 325472401.

It is an arithmetic number, because the mean of its divisors is an integer number (33920863704).

Almost surely, 2^{1021002003121} is an apocalyptic number.

It is an amenable number.

1021002003121 is a deficient number, since it is larger than the sum of its proper divisors (64465635407).

1021002003121 is a wasteful number, since it uses less digits than its factorization.

1021002003121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1021002003121 its reverse (1213002001201), we get a palindrome (2234004004322).

The spelling of 1021002003121 in words is "one trillion, twenty-one billion, two million, three thousand, one hundred twenty-one".