21910052 has 6 divisors (see below), whose sum is σ = 38342598. Its totient is φ = 10955024.

The previous prime is 21910043. The next prime is 21910061. The reversal of 21910052 is 25001912.

It is an interprime number because it is at equal distance from previous prime (21910043) and next prime (21910061).

It can be written as a sum of positive squares in only one way, i.e., 20016676 + 1893376 = 4474^2 + 1376^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2738753 + ... + 2738760.

It is an arithmetic number, because the mean of its divisors is an integer number (6390433).

Almost surely, 2^21910052 is an apocalyptic number.

It is an amenable number.

21910052 is a deficient number, since it is larger than the sum of its proper divisors (16432546).

21910052 is a wasteful number, since it uses less digits than its factorization.

21910052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5477517 (or 5477515 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 21910052 is about 4680.8174499760. The cubic root of 21910052 is about 279.8215359361.

Adding to 21910052 its reverse (25001912), we get a palindrome (46911964).

The spelling of 21910052 in words is "twenty-one million, nine hundred ten thousand, fifty-two".