21215201142 has 32 divisors (see below), whose sum is σ = 43241597280. Its totient is φ = 6936600320.

The previous prime is 21215201141. The next prime is 21215201207. The reversal of 21215201142 is 24110251212.

It is a super-3 number, since 3×21215201142³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215201141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2389792 + ... + 2398652.

It is an arithmetic number, because the mean of its divisors is an integer number (1351299915).

Almost surely, 2^21215201142 is an apocalyptic number.

21215201142 is an abundant number, since it is smaller than the sum of its proper divisors (22026396138).

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

21215201142 is a wasteful number, since it uses less digits than its factorization.

21215201142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16448.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21215201142 its reverse (24110251212), we get a palindrome (45325452354).

The spelling of 21215201142 in words is "twenty-one billion, two hundred fifteen million, two hundred one thousand, one hundred forty-two".