21222153140 has 12 divisors (see below), whose sum is σ = 44566521636. Its totient is φ = 8488861248.

The previous prime is 21222153137. The next prime is 21222153143. The reversal of 21222153140 is 4135122212.

It is an interprime number because it is at equal distance from previous prime (21222153137) and next prime (21222153143).

It can be written as a sum of positive squares in 2 ways, for example, as 3345928336 + 17876224804 = 57844^2 + 133702^2 .

It is a super-2 number, since 2×21222153140² (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 (21222153143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530553809 + ... + 530553848.

It is an arithmetic number, because the mean of its divisors is an integer number (3713876803).

Almost surely, 2^21222153140 is an apocalyptic number.

21222153140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222153140 is an abundant number, since it is smaller than the sum of its proper divisors (23344368496).

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

21222153140 is a wasteful number, since it uses less digits than its factorization.

21222153140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061107666 (or 1061107664 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21222153140 its reverse (4135122212), we get a palindrome (25357275352).

The spelling of 21222153140 in words is "twenty-one billion, two hundred twenty-two million, one hundred fifty-three thousand, one hundred forty".