21257033158 has 8 divisors (see below), whose sum is σ = 31941589320. Its totient is φ = 10609836720.

The previous prime is 21257033131. The next prime is 21257033173. The reversal of 21257033158 is 85133075212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21257033158² (a number of 21 digits) contains 22 as substring.

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, 9338508 + ... + 9340783.

It is an arithmetic number, because the mean of its divisors is an integer number (3992698665).

Almost surely, 2^21257033158 is an apocalyptic number.

21257033158 is a deficient number, since it is larger than the sum of its proper divisors (10684556162).

21257033158 is a wasteful number, since it uses less digits than its factorization.

21257033158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18679862.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 21257033158 in words is "twenty-one billion, two hundred fifty-seven million, thirty-three thousand, one hundred fifty-eight".