1010021221221 has 16 divisors (see below), whose sum is σ = 1425949867584. Its totient is φ = 633722114304.

The previous prime is 1010021221189. The next prime is 1010021221229. The reversal of 1010021221221 is 1221221200101.

It is not a de Polignac number, because 1010021221221 - 2⁵ = 1010021221189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1010021221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010021221229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1862391 + ... + 2342763.

It is an arithmetic number, because the mean of its divisors is an integer number (89121866724).

Almost surely, 2^{1010021221221} is an apocalyptic number.

It is an amenable number.

1010021221221 is a deficient number, since it is larger than the sum of its proper divisors (415928646363).

1010021221221 is a wasteful number, since it uses less digits than its factorization.

1010021221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521620.

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

Adding to 1010021221221 its reverse (1221221200101), we get a palindrome (2231242421322).

The spelling of 1010021221221 in words is "one trillion, ten billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".