21124220223402 has 24 divisors (see below), whose sum is σ = 46452265369536. Its totient is φ = 6936311117736.

The previous prime is 21124220223383. The next prime is 21124220223409. The reversal of 21124220223402 is 20432202242112.

21124220223402 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 422 + 0 + 2 + 234 + 0 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21124220223409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8757967378 + ... + 8757969789.

It is an arithmetic number, because the mean of its divisors is an integer number (1935511057064).

Almost surely, 2^{21124220223402} is an apocalyptic number.

21124220223402 is an abundant number, since it is smaller than the sum of its proper divisors (25328045146134).

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

21124220223402 is a wasteful number, since it uses less digits than its factorization.

21124220223402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17515937242 (or 17515937239 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21124220223402 its reverse (20432202242112), we get a palindrome (41556422465514).

The spelling of 21124220223402 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred twenty million, two hundred twenty-three thousand, four hundred two".