21930077 has 8 divisors (see below), whose sum is σ = 23684640. Its totient is φ = 20185200.

The previous prime is 21929993. The next prime is 21930101. The reversal of 21930077 is 77003912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21930077 - 2⁸ = 21929821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930577) 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, 2702 + ... + 7152.

It is an arithmetic number, because the mean of its divisors is an integer number (2960580).

Almost surely, 2^21930077 is an apocalyptic number.

It is an amenable number.

21930077 is a deficient number, since it is larger than the sum of its proper divisors (1754563).

21930077 is a wasteful number, since it uses less digits than its factorization.

21930077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4843.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 21930077 is about 4682.9560108974. The cubic root of 21930077 is about 279.9067589198.

Adding to 21930077 its reverse (77003912), we get a palindrome (98933989).

The spelling of 21930077 in words is "twenty-one million, nine hundred thirty thousand, seventy-seven".