21213476442 has 12 divisors (see below), whose sum is σ = 45962532330. Its totient is φ = 7071158808.

The previous prime is 21213476441. The next prime is 21213476447. The reversal of 21213476442 is 24467431212.

21213476442 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 4 + 7 + 644 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20595407121 + 618069321 = 143511^2 + 24861^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21213476397 and 21213476406.

It is not an unprimeable number, because it can be changed into a prime (21213476441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589263217 + ... + 589263252.

Almost surely, 2^21213476442 is an apocalyptic number.

21213476442 is an abundant number, since it is smaller than the sum of its proper divisors (24749055888).

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

21213476442 is a wasteful number, since it uses less digits than its factorization.

21213476442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178526477 (or 1178526474 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The spelling of 21213476442 in words is "twenty-one billion, two hundred thirteen million, four hundred seventy-six thousand, four hundred forty-two".