21090002394 has 16 divisors (see below), whose sum is σ = 44400005280. Its totient is φ = 6660000720.

The previous prime is 21090002387. The next prime is 21090002407. The reversal of 21090002394 is 49320009012.

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, 92499897 + ... + 92500124.

It is an arithmetic number, because the mean of its divisors is an integer number (2775000330).

Almost surely, 2^21090002394 is an apocalyptic number.

21090002394 is an abundant number, since it is smaller than the sum of its proper divisors (23310002886).

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

21090002394 is a wasteful number, since it uses less digits than its factorization.

21090002394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185000045.

The product of its (nonzero) digits is 3888, while the sum is 30.

The spelling of 21090002394 in words is "twenty-one billion, ninety million, two thousand, three hundred ninety-four".