21221001143 has 8 divisors (see below), whose sum is σ = 22339326000. Its totient is φ = 20102819328.

The previous prime is 21221001103. The next prime is 21221001167. The reversal of 21221001143 is 34110012212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221001143 - 2⁸ = 21221000887 is a prime.

It is a super-2 number, since 2×21221001143² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221001103) 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, 413783 + ... + 462231.

It is an arithmetic number, because the mean of its divisors is an integer number (2792415750).

Almost surely, 2^21221001143 is an apocalyptic number.

21221001143 is a deficient number, since it is larger than the sum of its proper divisors (1118324857).

21221001143 is a wasteful number, since it uses less digits than its factorization.

21221001143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71521.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21221001143 its reverse (34110012212), we get a palindrome (55331013355).

The spelling of 21221001143 in words is "twenty-one billion, two hundred twenty-one million, one thousand, one hundred forty-three".