21901030 has 8 divisors (see below), whose sum is σ = 39421872. Its totient is φ = 8760408.

The previous prime is 21901021. The next prime is 21901051. The reversal of 21901030 is 3010912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21900995 and 21901013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095042 + ... + 1095061.

It is an arithmetic number, because the mean of its divisors is an integer number (4927734).

Almost surely, 2^21901030 is an apocalyptic number.

21901030 is a deficient number, since it is larger than the sum of its proper divisors (17520842).

21901030 is a wasteful number, since it uses less digits than its factorization.

21901030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190110.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 21901030 is about 4679.8536301897. The cubic root of 21901030 is about 279.7831228751.

Adding to 21901030 its reverse (3010912), we get a palindrome (24911942).

The spelling of 21901030 in words is "twenty-one million, nine hundred one thousand, thirty".