21021140140 has 144 divisors (see below), whose sum is σ = 60329604384. Its totient is φ = 6048000000.

The previous prime is 21021140131. The next prime is 21021140159. The reversal of 21021140140 is 4104112012.

It is a happy number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 65140 + ... + 215140.

It is an arithmetic number, because the mean of its divisors is an integer number (418955586).

Almost surely, 2^21021140140 is an apocalyptic number.

21021140140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021140140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30164802192).

21021140140 is an abundant number, since it is smaller than the sum of its proper divisors (39308464244).

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

21021140140 is a wasteful number, since it uses less digits than its factorization.

21021140140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150048 (or 150039 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021140140 its reverse (4104112012), we get a palindrome (25125252152).

It can be divided in two parts, 21021 and 140140, that added together give a palindrome (161161).

The spelling of 21021140140 in words is "twenty-one billion, twenty-one million, one hundred forty thousand, one hundred forty".