21213403642344 has 32 divisors (see below), whose sum is σ = 53126387439840. Its totient is φ = 7058750769600.

The previous prime is 21213403642303. The next prime is 21213403642351. The reversal of 21213403642344 is 44324630431212.

It is a super-4 number, since 4×21213403642344⁴ (a number of 54 digits) contains 4444 as substring.

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, 773972127 + ... + 773999534.

It is an arithmetic number, because the mean of its divisors is an integer number (1660199607495).

Almost surely, 2^{21213403642344} is an apocalyptic number.

21213403642344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21213403642344 is an abundant number, since it is smaller than the sum of its proper divisors (31912983797496).

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

21213403642344 is a wasteful number, since it uses less digits than its factorization.

21213403642344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547972241 (or 1547972237 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 39.

The spelling of 21213403642344 in words is "twenty-one trillion, two hundred thirteen billion, four hundred three million, six hundred forty-two thousand, three hundred forty-four".