921142229 has 12 divisors (see below), whose sum is σ = 1134565164. Its totient is φ = 743105664.

The previous prime is 921142223. The next prime is 921142231. The reversal of 921142229 is 922241129.

It can be written as a sum of positive squares in 2 ways, for example, as 819676900 + 101465329 = 28630^2 + 10073^2 .

It is not a de Polignac number, because 921142229 - 2²⁰ = 920093653 is a prime.

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 = 921142195 and 921142204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921142223) 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, 552074 + ... + 553739.

It is an arithmetic number, because the mean of its divisors is an integer number (94547097).

Almost surely, 2^921142229 is an apocalyptic number.

It is an amenable number.

921142229 is a deficient number, since it is larger than the sum of its proper divisors (213422935).

921142229 is a wasteful number, since it uses less digits than its factorization.

921142229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105844 (or 1105837 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 921142229 is about 30350.3250229713. The cubic root of 921142229 is about 972.9911666986.

The spelling of 921142229 in words is "nine hundred twenty-one million, one hundred forty-two thousand, two hundred twenty-nine".