21353502112 has 12 divisors (see below), whose sum is σ = 42039707346. Its totient is φ = 10676751040.

The previous prime is 21353502091. The next prime is 21353502133. The reversal of 21353502112 is 21120535312.

It is an interprime number because it is at equal distance from previous prime (21353502091) and next prime (21353502133).

It can be written as a sum of positive squares in only one way, i.e., 19791987856 + 1561514256 = 140684^2 + 39516^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333648439 + ... + 333648502.

Almost surely, 2^21353502112 is an apocalyptic number.

It is an amenable number.

21353502112 is a deficient number, since it is larger than the sum of its proper divisors (20686205234).

21353502112 is an equidigital number, since it uses as much as digits as its factorization.

21353502112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667296951 (or 667296943 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The spelling of 21353502112 in words is "twenty-one billion, three hundred fifty-three million, five hundred two thousand, one hundred twelve".