21141020240 has 40 divisors (see below), whose sum is σ = 50351730408. Its totient is φ = 8250152960.

The previous prime is 21141020237. The next prime is 21141020249. The reversal of 21141020240 is 4202014112.

It can be written as a sum of positive squares in 4 ways, for example, as 35904064 + 21105116176 = 5992^2 + 145276^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×21141020240³ (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 (21141020249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3219437 + ... + 3225996.

Almost surely, 2^21141020240 is an apocalyptic number.

21141020240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21141020240 is an abundant number, since it is smaller than the sum of its proper divisors (29210710168).

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

21141020240 is a wasteful number, since it uses less digits than its factorization.

21141020240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445487 (or 6445481 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21141020240 its reverse (4202014112), we get a palindrome (25343034352).

The spelling of 21141020240 in words is "twenty-one billion, one hundred forty-one million, twenty thousand, two hundred forty".