21348938244 has 24 divisors (see below), whose sum is σ = 49820178240. Its totient is φ = 7115457184.

The previous prime is 21348938243. The next prime is 21348938267. The reversal of 21348938244 is 44283984312.

It is a super-2 number, since 2×21348938244² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21348938193 and 21348938202.

It is not an unprimeable number, because it can be changed into a prime (21348938243) 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, 1417 + ... + 206639.

It is an arithmetic number, because the mean of its divisors is an integer number (2075840760).

Almost surely, 2^21348938244 is an apocalyptic number.

It is an amenable number.

21348938244 is an abundant number, since it is smaller than the sum of its proper divisors (28471239996).

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

21348938244 is a wasteful number, since it uses less digits than its factorization.

21348938244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213899 (or 213897 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 48.

The spelling of 21348938244 in words is "twenty-one billion, three hundred forty-eight million, nine hundred thirty-eight thousand, two hundred forty-four".