152021021 has 4 divisors (see below), whose sum is σ = 160963452. Its totient is φ = 143078592.

The previous prime is 152021017. The next prime is 152021081. The reversal of 152021021 is 120120251.

152021021 = 2098² + 2099² + ... + 2131².

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

It can be written as a sum of positive squares in 2 ways, for example, as 133864900 + 18156121 = 11570^2 + 4261^2 .

It is a cyclic number.

It is not a de Polignac number, because 152021021 - 2² = 152021017 is a prime.

It is a super-2 number, since 2×152021021² = 46220781651764882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 152020987 and 152021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (152021081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4471190 + ... + 4471223.

It is an arithmetic number, because the mean of its divisors is an integer number (40240863).

Almost surely, 2^152021021 is an apocalyptic number.

It is an amenable number.

152021021 is a deficient number, since it is larger than the sum of its proper divisors (8942431).

152021021 is an equidigital number, since it uses as much as digits as its factorization.

152021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8942430.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 152021021 is about 12329.6804905886. The cubic root of 152021021 is about 533.7049305713.

Adding to 152021021 its reverse (120120251), we get a palindrome (272141272).

The spelling of 152021021 in words is "one hundred fifty-two million, twenty-one thousand, twenty-one".