10021121321221 has 16 divisors (see below), whose sum is σ = 10728167630400. Its totient is φ = 9332061798528.

The previous prime is 10021121321179. The next prime is 10021121321303. The reversal of 10021121321221 is 12212312112001.

It is a cyclic number.

It is not a de Polignac number, because 10021121321221 - 2¹³ = 10021121313029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021121328221) 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, 14432211 + ... + 15110623.

It is an arithmetic number, because the mean of its divisors is an integer number (670510476900).

Almost surely, 2^{10021121321221} is an apocalyptic number.

It is an amenable number.

10021121321221 is a deficient number, since it is larger than the sum of its proper divisors (707046309179).

10021121321221 is a wasteful number, since it uses less digits than its factorization.

10021121321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691668.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 10021121321221 its reverse (12212312112001), we get a palindrome (22233433433222).

The spelling of 10021121321221 in words is "ten trillion, twenty-one billion, one hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-one".