21098225842 has 4 divisors (see below), whose sum is σ = 31647338766. Its totient is φ = 10549112920.

The previous prime is 21098225839. The next prime is 21098225873. The reversal of 21098225842 is 24852289012.

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., 20759334561 + 338891281 = 144081^2 + 18409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5274556459 + ... + 5274556462.

Almost surely, 2^21098225842 is an apocalyptic number.

21098225842 is a deficient number, since it is larger than the sum of its proper divisors (10549112924).

21098225842 is a wasteful number, since it uses less digits than its factorization.

21098225842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10549112923.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 21098225842 in words is "twenty-one billion, ninety-eight million, two hundred twenty-five thousand, eight hundred forty-two".