21877094 has 16 divisors (see below), whose sum is σ = 36046080. Its totient is φ = 9911880.

The previous prime is 21877091. The next prime is 21877099. The reversal of 21877094 is 49077812.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21877091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11642 + ... + 13389.

It is an arithmetic number, because the mean of its divisors is an integer number (2252880).

Almost surely, 2^21877094 is an apocalyptic number.

21877094 is a deficient number, since it is larger than the sum of its proper divisors (14168986).

21877094 is a wasteful number, since it uses less digits than its factorization.

21877094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25075.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 21877094 is about 4677.2955861267. The cubic root of 21877094 is about 279.6811591771.

It can be divided in two parts, 2187709 and 4, that multiplied together give a triangular number (8750836 = T₄₁₈₃).

The spelling of 21877094 in words is "twenty-one million, eight hundred seventy-seven thousand, ninety-four".