121285021 has 16 divisors (see below), whose sum is σ = 150873408. Its totient is φ = 95788800.

The previous prime is 121284979. The next prime is 121285033. The reversal of 121285021 is 120582121.

It is a cyclic number.

It is not a de Polignac number, because 121285021 - 2⁷ = 121284893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121284983 and 121285001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121285321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22515 + ... + 27376.

It is an arithmetic number, because the mean of its divisors is an integer number (9429588).

Almost surely, 2^121285021 is an apocalyptic number.

121285021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121285021 is a deficient number, since it is larger than the sum of its proper divisors (29588387).

121285021 is a wasteful number, since it uses less digits than its factorization.

121285021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49932.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 121285021 is about 11012.9478796551. The cubic root of 121285021 is about 494.9967975850.

The spelling of 121285021 in words is "one hundred twenty-one million, two hundred eighty-five thousand, twenty-one".