1021010131221 has 32 divisors (see below), whose sum is σ = 1369948715520. Its totient is φ = 676390708224.

The previous prime is 1021010131157. The next prime is 1021010131249. The reversal of 1021010131221 is 1221310101201.

It is not a de Polignac number, because 1021010131221 - 2⁶ = 1021010131157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021010131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021010131121) 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, 574568685 + ... + 574570461.

It is an arithmetic number, because the mean of its divisors is an integer number (42810897360).

Almost surely, 2^{1021010131221} is an apocalyptic number.

It is an amenable number.

1021010131221 is a deficient number, since it is larger than the sum of its proper divisors (348938584299).

1021010131221 is a wasteful number, since it uses less digits than its factorization.

1021010131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1021010131221 its reverse (1221310101201), we get a palindrome (2242320232422).

The spelling of 1021010131221 in words is "one trillion, twenty-one billion, ten million, one hundred thirty-one thousand, two hundred twenty-one".