21100012248 has 64 divisors (see below), whose sum is σ = 60433344000. Its totient is φ = 6013815552.

The previous prime is 21100012189. The next prime is 21100012249. The reversal of 21100012248 is 84221000112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100012249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84828 + ... + 222251.

It is an arithmetic number, because the mean of its divisors is an integer number (944271000).

Almost surely, 2^21100012248 is an apocalyptic number.

21100012248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21100012248 is an abundant number, since it is smaller than the sum of its proper divisors (39333331752).

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

21100012248 is a wasteful number, since it uses less digits than its factorization.

21100012248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307504 (or 307500 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The spelling of 21100012248 in words is "twenty-one billion, one hundred million, twelve thousand, two hundred forty-eight".