1011421321221 has 16 divisors (see below), whose sum is σ = 1349263586048. Its totient is φ = 673930065600.

The previous prime is 1011421321189. The next prime is 1011421321231. The reversal of 1011421321221 is 1221231241101.

1011421321221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1011421321221 - 2⁵ = 1011421321189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011421321231) 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, 85555491 + ... + 85567311.

It is an arithmetic number, because the mean of its divisors is an integer number (84328974128).

Almost surely, 2^{1011421321221} is an apocalyptic number.

It is an amenable number.

1011421321221 is a deficient number, since it is larger than the sum of its proper divisors (337842264827).

1011421321221 is a wasteful number, since it uses less digits than its factorization.

1011421321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24252.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 1011421321221 its reverse (1221231241101), we get a palindrome (2232652562322).

The spelling of 1011421321221 in words is "one trillion, eleven billion, four hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-one".