21144322002 has 16 divisors (see below), whose sum is σ = 42683866272. Its totient is φ = 6982236960.

The previous prime is 21144321973. The next prime is 21144322039. The reversal of 21144322002 is 20022344112.

It is a super-2 number, since 2×21144322002² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21144322002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16466899 + ... + 16468182.

It is an arithmetic number, because the mean of its divisors is an integer number (2667741642).

Almost surely, 2^21144322002 is an apocalyptic number.

21144322002 is an abundant number, since it is smaller than the sum of its proper divisors (21539544270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144322002 is a wasteful number, since it uses less digits than its factorization.

21144322002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32935193.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21144322002 its reverse (20022344112), we get a palindrome (41166666114).

The spelling of 21144322002 in words is "twenty-one billion, one hundred forty-four million, three hundred twenty-two thousand, two".