21212002194 has 16 divisors (see below), whose sum is σ = 42428654400. Its totient is φ = 7069892400.

The previous prime is 21212002193. The next prime is 21212002261. The reversal of 21212002194 is 49120021212.

It is not an unprimeable number, because it can be changed into a prime (21212002193) 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, 132982 + ... + 245169.

It is an arithmetic number, because the mean of its divisors is an integer number (2651790900).

Almost surely, 2^21212002194 is an apocalyptic number.

21212002194 is an abundant number, since it is smaller than the sum of its proper divisors (21216652206).

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

21212002194 is a wasteful number, since it uses less digits than its factorization.

21212002194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387505.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 21212002194 in words is "twenty-one billion, two hundred twelve million, two thousand, one hundred ninety-four".