21217386149212 has 24 divisors (see below), whose sum is σ = 40506369895152. Its totient is φ = 9644159078400.

The previous prime is 21217386149209. The next prime is 21217386149231. The reversal of 21217386149212 is 21294168371212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1383162 + ... + 6659422.

It is an arithmetic number, because the mean of its divisors is an integer number (1687765412298).

Almost surely, 2^{21217386149212} is an apocalyptic number.

21217386149212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21217386149212 is a deficient number, since it is larger than the sum of its proper divisors (19288983745940).

21217386149212 is a wasteful number, since it uses less digits than its factorization.

21217386149212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367669 (or 5367667 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The spelling of 21217386149212 in words is "twenty-one trillion, two hundred seventeen billion, three hundred eighty-six million, one hundred forty-nine thousand, two hundred twelve".