21921038350 has 24 divisors (see below), whose sum is σ = 40777044120. Its totient is φ = 8767573920.

The previous prime is 21921038281. The next prime is 21921038351. The reversal of 21921038350 is 5383012912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21921038351) 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, 939121 + ... + 962179.

It is an arithmetic number, because the mean of its divisors is an integer number (1699043505).

Almost surely, 2^21921038350 is an apocalyptic number.

21921038350 is a deficient number, since it is larger than the sum of its proper divisors (18856005770).

21921038350 is a wasteful number, since it uses less digits than its factorization.

21921038350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42084 (or 42079 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 21921038350 in words is "twenty-one billion, nine hundred twenty-one million, thirty-eight thousand, three hundred fifty".