21202141540 has 24 divisors (see below), whose sum is σ = 44932983480. Its totient is φ = 8403049728.

The previous prime is 21202141517. The next prime is 21202141603. The reversal of 21202141540 is 4514120212.

It can be written as a sum of positive squares in 4 ways, for example, as 9862873344 + 11339268196 = 99312^2 + 106486^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4860697 + ... + 4865056.

It is an arithmetic number, because the mean of its divisors is an integer number (1872207645).

Almost surely, 2^21202141540 is an apocalyptic number.

21202141540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202141540 is an abundant number, since it is smaller than the sum of its proper divisors (23730841940).

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

21202141540 is a wasteful number, since it uses less digits than its factorization.

21202141540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9725871 (or 9725869 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21202141540 its reverse (4514120212), we get a palindrome (25716261752).

The spelling of 21202141540 in words is "twenty-one billion, two hundred two million, one hundred forty-one thousand, five hundred forty".