21214026137508 has 24 divisors (see below), whose sum is σ = 49637275652160. Its totient is φ = 7051644712800.

The previous prime is 21214026137483. The next prime is 21214026137509. The reversal of 21214026137508 is 80573162041212.

It is a self number, because there is not a number n which added to its sum of digits gives 21214026137508.

It is not an unprimeable number, because it can be changed into a prime (21214026137509) 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, 2462162143 + ... + 2462170758.

It is an arithmetic number, because the mean of its divisors is an integer number (2068219818840).

Almost surely, 2^{21214026137508} is an apocalyptic number.

It is an amenable number.

21214026137508 is an abundant number, since it is smaller than the sum of its proper divisors (28423249514652).

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

21214026137508 is a wasteful number, since it uses less digits than its factorization.

21214026137508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924333267 (or 4924333265 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 21214026137508 in words is "twenty-one trillion, two hundred fourteen billion, twenty-six million, one hundred thirty-seven thousand, five hundred eight".