21214026632440 has 16 divisors (see below), whose sum is σ = 47731559923080. Its totient is φ = 8485610652960.

The previous prime is 21214026632423. The next prime is 21214026632471. The reversal of 21214026632440 is 4423662041212.

It is a self number, because there is not a number n which added to its sum of digits gives 21214026632440.

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, 265175332866 + ... + 265175332945.

Almost surely, 2^{21214026632440} is an apocalyptic number.

21214026632440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214026632440 is an abundant number, since it is smaller than the sum of its proper divisors (26517533290640).

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

21214026632440 is a wasteful number, since it uses less digits than its factorization.

21214026632440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530350665822 (or 530350665818 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

Adding to 21214026632440 its reverse (4423662041212), we get a palindrome (25637688673652).

The spelling of 21214026632440 in words is "twenty-one trillion, two hundred fourteen billion, twenty-six million, six hundred thirty-two thousand, four hundred forty".