101521020 has 24 divisors (see below), whose sum is σ = 284259024. Its totient is φ = 27072256.

The previous prime is 101521003. The next prime is 101521031. The reversal of 101521020 is 20125101.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 101520987 and 101521005.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 845949 + ... + 846068.

It is an arithmetic number, because the mean of its divisors is an integer number (11844126).

Almost surely, 2^101521020 is an apocalyptic number.

101521020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101521020 is an abundant number, since it is smaller than the sum of its proper divisors (182738004).

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

101521020 is a wasteful number, since it uses less digits than its factorization.

101521020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692029 (or 1692027 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 101521020 is about 10075.7639908843. The cubic root of 101521020 is about 466.5003681836.

Adding to 101521020 its reverse (20125101), we get a palindrome (121646121).

The spelling of 101521020 in words is "one hundred one million, five hundred twenty-one thousand, twenty".