21157062 has 8 divisors (see below), whose sum is σ = 42314136. Its totient is φ = 7052352.

The previous prime is 21157049. The next prime is 21157067. The reversal of 21157062 is 26075112.

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

21157062 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21157067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763083 + ... + 1763094.

It is an arithmetic number, because the mean of its divisors is an integer number (5289267).

Almost surely, 2^21157062 is an apocalyptic number.

21157062 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21157062 is a wasteful number, since it uses less digits than its factorization.

21157062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526182.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 21157062 is about 4599.6806410880. The cubic root of 21157062 is about 276.5785229122.

The spelling of 21157062 in words is "twenty-one million, one hundred fifty-seven thousand, sixty-two".