21045201241240 has 64 divisors (see below), whose sum is σ = 52857714792960. Its totient is φ = 7474828341120.

The previous prime is 21045201241201. The next prime is 21045201241313. The reversal of 21045201241240 is 4214210254012.

It is a junction number, because it is equal to n+sod(n) for n = 21045201241199 and 21045201241208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556143904 + ... + 556181743.

It is an arithmetic number, because the mean of its divisors is an integer number (825901793640).

Almost surely, 2^{21045201241240} is an apocalyptic number.

21045201241240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21045201241240 is an abundant number, since it is smaller than the sum of its proper divisors (31812513551720).

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

21045201241240 is a wasteful number, since it uses less digits than its factorization.

21045201241240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112325712 (or 1112325708 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 21045201241240 its reverse (4214210254012), we get a palindrome (25259411495252).

The spelling of 21045201241240 in words is "twenty-one trillion, forty-five billion, two hundred one million, two hundred forty-one thousand, two hundred forty".