21111248279498 has 8 divisors (see below), whose sum is σ = 34102785682308. Its totient is φ = 9743653052064.

The previous prime is 21111248279497. The next prime is 21111248279551. The reversal of 21111248279498 is 89497284211112.

It can be written as a sum of positive squares in 2 ways, for example, as 20587154812249 + 524093467249 = 4537307^2 + 723943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21111248279497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405985543811 + ... + 405985543862.

Almost surely, 2^{21111248279498} is an apocalyptic number.

21111248279498 is a deficient number, since it is larger than the sum of its proper divisors (12991537402810).

21111248279498 is a wasteful number, since it uses less digits than its factorization.

21111248279498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811971087688.

The product of its digits is 4644864, while the sum is 59.

The spelling of 21111248279498 in words is "twenty-one trillion, one hundred eleven billion, two hundred forty-eight million, two hundred seventy-nine thousand, four hundred ninety-eight".