21221121101 has 8 divisors (see below), whose sum is σ = 21355098624. Its totient is φ = 21087190080.

The previous prime is 21221121067. The next prime is 21221121149. The reversal of 21221121101 is 10112112212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221121101 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 (21221141101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589285 + ... + 1602581.

It is an arithmetic number, because the mean of its divisors is an integer number (2669387328).

Almost surely, 2^21221121101 is an apocalyptic number.

It is an amenable number.

21221121101 is a deficient number, since it is larger than the sum of its proper divisors (133977523).

21221121101 is a wasteful number, since it uses less digits than its factorization.

21221121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23251.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221121101 its reverse (10112112212), we get a palindrome (31333233313).

It can be divided in two parts, 21 and 221121101, that added together give a palindrome (221121122).

The spelling of 21221121101 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred one".