21030101240 has 16 divisors (see below), whose sum is σ = 47317727880. Its totient is φ = 8412040480.

The previous prime is 21030101237. The next prime is 21030101263. The reversal of 21030101240 is 4210103012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262876226 + ... + 262876305.

Almost surely, 2^21030101240 is an apocalyptic number.

21030101240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030101240 is an abundant number, since it is smaller than the sum of its proper divisors (26287626640).

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

21030101240 is a wasteful number, since it uses less digits than its factorization.

21030101240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525752542 (or 525752538 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21030101240 its reverse (4210103012), we get a palindrome (25240204252).

The spelling of 21030101240 in words is "twenty-one billion, thirty million, one hundred one thousand, two hundred forty".