21740948 has 6 divisors (see below), whose sum is σ = 38046666. Its totient is φ = 10870472.

The previous prime is 21740903. The next prime is 21740963. The reversal of 21740948 is 84904712.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 3319684 = 4292^2 + 1822^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2717615 + ... + 2717622.

It is an arithmetic number, because the mean of its divisors is an integer number (6341111).

Almost surely, 2^21740948 is an apocalyptic number.

It is an amenable number.

21740948 is a deficient number, since it is larger than the sum of its proper divisors (16305718).

21740948 is a wasteful number, since it uses less digits than its factorization.

21740948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5435241 (or 5435239 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21740948 is about 4662.7189492827. The cubic root of 21740948 is about 279.0997788911.

The spelling of 21740948 in words is "twenty-one million, seven hundred forty thousand, nine hundred forty-eight".