21949030 has 8 divisors (see below), whose sum is σ = 39508272. Its totient is φ = 8779608.

The previous prime is 21949021. The next prime is 21949033. The reversal of 21949030 is 3094912.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21949030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21949033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097442 + ... + 1097461.

It is an arithmetic number, because the mean of its divisors is an integer number (4938534).

Almost surely, 2^21949030 is an apocalyptic number.

21949030 is a deficient number, since it is larger than the sum of its proper divisors (17559242).

21949030 is a wasteful number, since it uses less digits than its factorization.

21949030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194910.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 21949030 is about 4684.9791888545. The cubic root of 21949030 is about 279.9873718795.

The spelling of 21949030 in words is "twenty-one million, nine hundred forty-nine thousand, thirty".