133252021 has 12 divisors (see below), whose sum is σ = 156198240. Its totient is φ = 113338680.

The previous prime is 133251991. The next prime is 133252037. The reversal of 133252021 is 120252331.

It is not a de Polignac number, because 133252021 - 2⁷ = 133251893 is a prime.

It is a super-2 number, since 2×133252021² = 35512202201168882, which contains 22 as substring.

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 133252021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139252021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3961 + ... + 16798.

It is an arithmetic number, because the mean of its divisors is an integer number (13016520).

Almost surely, 2^133252021 is an apocalyptic number.

It is an amenable number.

133252021 is a deficient number, since it is larger than the sum of its proper divisors (22946219).

133252021 is a wasteful number, since it uses less digits than its factorization.

133252021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20904 (or 20897 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 133252021 is about 11543.4839195106. The cubic root of 133252021 is about 510.7690831310.

The spelling of 133252021 in words is "one hundred thirty-three million, two hundred fifty-two thousand, twenty-one".