21949077 has 4 divisors (see below), whose sum is σ = 29265440. Its totient is φ = 14632716.

The previous prime is 21949069. The next prime is 21949087. The reversal of 21949077 is 77094912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21949077 - 2³ = 21949069 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 (21949087) 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, 3658177 + ... + 3658182.

It is an arithmetic number, because the mean of its divisors is an integer number (7316360).

Almost surely, 2^21949077 is an apocalyptic number.

It is an amenable number.

21949077 is a deficient number, since it is larger than the sum of its proper divisors (7316363).

21949077 is an equidigital number, since it uses as much as digits as its factorization.

21949077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7316362.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 21949077 is about 4684.9842048827. The cubic root of 21949077 is about 279.9875717273.

The spelling of 21949077 in words is "twenty-one million, nine hundred forty-nine thousand, seventy-seven".