21492098 has 4 divisors (see below), whose sum is σ = 32238150. Its totient is φ = 10746048.

The previous prime is 21492067. The next prime is 21492151. The reversal of 21492098 is 89029412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20948929 + 543169 = 4577^2 + 737^2 .

It is a super-4 number, since 4×21492098⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5373023 + ... + 5373026.

Almost surely, 2^21492098 is an apocalyptic number.

21492098 is a deficient number, since it is larger than the sum of its proper divisors (10746052).

21492098 is a wasteful number, since it uses less digits than its factorization.

21492098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10746051.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 21492098 is about 4635.9570748660. The cubic root of 21492098 is about 278.0308179696.

The spelling of 21492098 in words is "twenty-one million, four hundred ninety-two thousand, ninety-eight".