21490896237240 has 64 divisors (see below), whose sum is σ = 67865988124800. Its totient is φ = 5429279048832.

The previous prime is 21490896237143. The next prime is 21490896237247. The reversal of 21490896237240 is 4273269809412.

It is a happy number.

It is a super-3 number, since 3×21490896237240³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21490896237247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4712913562 + ... + 4712918121.

It is an arithmetic number, because the mean of its divisors is an integer number (1060406064450).

Almost surely, 2^{21490896237240} is an apocalyptic number.

21490896237240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21490896237240 is an abundant number, since it is smaller than the sum of its proper divisors (46375091887560).

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

21490896237240 is a wasteful number, since it uses less digits than its factorization.

21490896237240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9425831716 (or 9425831712 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 21490896237240 in words is "twenty-one trillion, four hundred ninety billion, eight hundred ninety-six million, two hundred thirty-seven thousand, two hundred forty".