21948877 has 8 divisors (see below), whose sum is σ = 23436864. Its totient is φ = 20505408.

The previous prime is 21948863. The next prime is 21948893. The reversal of 21948877 is 77884912.

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 21948877 - 2⁷ = 21948749 is a prime.

It is a super-2 number, since 2×21948877² = 963506403122258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948827) 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, 10108 + ... + 12085.

It is an arithmetic number, because the mean of its divisors is an integer number (2929608).

Almost surely, 2^21948877 is an apocalyptic number.

It is an amenable number.

21948877 is a deficient number, since it is larger than the sum of its proper divisors (1487987).

21948877 is a wasteful number, since it uses less digits than its factorization.

21948877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22259.

The product of its digits is 225792, while the sum is 46.

The square root of 21948877 is about 4684.9628600449. The cubic root of 21948877 is about 279.9867213091.

The spelling of 21948877 in words is "twenty-one million, nine hundred forty-eight thousand, eight hundred seventy-seven".