157446021 has 4 divisors (see below), whose sum is σ = 209928032. Its totient is φ = 104964012.

The previous prime is 157446019. The next prime is 157446041. The reversal of 157446021 is 120644751.

157446021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 157446021 - 2¹ = 157446019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157446021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157446011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26241001 + ... + 26241006.

It is an arithmetic number, because the mean of its divisors is an integer number (52482008).

Almost surely, 2^157446021 is an apocalyptic number.

It is an amenable number.

157446021 is a deficient number, since it is larger than the sum of its proper divisors (52482011).

157446021 is an equidigital number, since it uses as much as digits as its factorization.

157446021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52482010.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 157446021 is about 12547.7496388795. The cubic root of 157446021 is about 539.9794470915.

The spelling of 157446021 in words is "one hundred fifty-seven million, four hundred forty-six thousand, twenty-one".