21910036 has 12 divisors (see below), whose sum is σ = 38443860. Its totient is φ = 10926080.

The previous prime is 21910013. The next prime is 21910043. The reversal of 21910036 is 63001912.

It can be written as a sum of positive squares in 2 ways, for example, as 11861136 + 10048900 = 3444^2 + 3170^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21909989 and 21910016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5485 + ... + 8596.

It is an arithmetic number, because the mean of its divisors is an integer number (3203655).

Almost surely, 2^21910036 is an apocalyptic number.

It is an amenable number.

21910036 is a deficient number, since it is larger than the sum of its proper divisors (16533824).

21910036 is a wasteful number, since it uses less digits than its factorization.

21910036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14474 (or 14472 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 21910036 is about 4680.8157408725. The cubic root of 21910036 is about 279.8214678221.

Adding to 21910036 its reverse (63001912), we get a palindrome (84911948).

The spelling of 21910036 in words is "twenty-one million, nine hundred ten thousand, thirty-six".